I am mechanical engineer and tape mechanisms are the most difficult things I have faced to repair...make me feel so lazy when I think of them. Amazing job!!
As always, Your knowledge in electronics is just amazing. You do much more than just troubleshoot. As your soldering and replacing defective components. You take out the schematics and explain how the circuit operates. Which has been a great help to me. Please do not worry about the thumbs down and keep those videos coming!!
As a young..ish tech. As I was often called. I'd like to say that your videos are inspirational to me. I have learned a lot about many things from you in just the last month or so. For that I thank you kindly, I watch several of your videos every day. You're a great tech!
One thing I could add to what is shown here - I recommend to try using a solder sucker when reworking some suspect solder joints. I had a case once where a Yamaha portable multi-track casette deck had a power issue and it turned out the pads of several traces that were supposed to be running to the power transformer had broken off from their traces but were still soldered to the pins. You could not see the separation lines under the solder and flux. Once the solder was sucked away from each pin, the breaks from pad to trace were obvious using an eye loupe. Each pin had to be bridged or jumped over to make a solid connection to its associated trace on the board. Simple reflowing did not work in this case, because the pads that had detached from the board created little islands and were just enough removed from each trace to not allow solder to flow over onto the traces, due to the green solder mask.
Greetings from New Zealand, Dave. Great work and repair, as always. New camera aspect is appreciated by us all. Keep up with these videos, I'm learning a lot.
The nice thing about having the camera on a jib is I can still use it for regular shooting without changing it. If I am working on a TV, I can have it over the bench looking at the TV from an angle rather than at my back.
Thank you very much. I decided that I am going to learn how to repair amplifier after watching this video. This video gives me confidence and i really enjoy watching the process of repairing it. This video is the best ever.
I have the same issue in an old "work shop" receiver. It's been through hell. Great video - don't worry about haters. Thank you for your time and insight.
These are very nice amps. I still have one of these on sub duty, power amp only. The dynamic power is increddible on these. RMS power is only 90 Watts per channel on four Ohms, dynamic however is near fourhundred capable of killing my subs. Love the amp to bits
Yeah the overhead view is great, there was a nice flash at 4:08! So happens I have been listening to you on a NAD 2400 monitor amp that a friend found on the street and gave to me. The 2400 does have a protection circuit... and that was the problem! Had a bad capacitor and by co-incidence the output transistor bias was also off by enough to trigger the protection circuit. I only fixed it thanks to a post on a forum about amplifiers, saying to check the bias and replace that capacitor, wish I could remember where that was.
pretty nice job as always can’t wait to see another great repair video from your excellent channel keep it up my friend and thank you for keeping vintage alive
welll not only are you very wise and talented and knowledgable you are very creative as well with a camera mounting bravo I have a theory about when people purchase from places like ebay or amazon that if they drop the package hard to the ground it might be possible to losten connections on the circuit boards . I learn something from you all the time have a great night and est of your week
Nice job as always. On this one though I'd suggest the first step should have been to pull the pre-out/main-in jumpers and substitute a patch cable, with the L/R channels crossed. That would immediately cut the problem in half. (Right channel cutting out now? Problem is on the preamp side. Left channel still cutting out? It's on the power amp side.) On the other hand it's good that you reworked connections on both sides, and found the too-long pins, and if staying on one side of the unit would have made me miss those, then that's a point against me. :-) Thanks for all the vids.
Got to say I have only recently stumbled across your channel. I love it :) Very interesting and informative especially for a fumbling old duffer like me who is trying to learn about electronics. Ok, I'm not really so old at 54 but the health problems I have make me feel that way. Enough of that self pitying crap! Well done on an excellent channel and to hell with those who insist on giving you a thumbs down :( They can stick their thumbs where the sun doesn't rise, to pinch your phraseology ;) Cheers.
@@joeygonzo I always warn the missus- never tidy my bench thinking you're doing me a favour, you'll just mess up the "filing system" that's in my head. It also makes things more difficult for potential thieves since they can't tell what's worth nabbing and what's junk lol
don't understand the dislikes, I used to manage a shop, and watching you work I have no complaints. I would have bee happy to have a tech like you working for us.
They are the trolls You know losers that have no other purpose in life but to dislike videos, sit on their ass collecting welfare and cause cival disobedience with protests over anything and everything. They are pests just like termites and carpenter ants and they should be treated so such.
Great stuff. I remember wanting to be a electronic technician when i was young but wasnt allowed pursue that career, parents had other thoughts, fast forward 35 years and im doing this as a hobby........especially great during lockdown. Love your vids....
I never wanted to do it. I wanted to go into the broadcasting business but my mother wanted nothing if that. Her friends husband did that and was regularly out if work. That was before the big explosion of film and TV here in Hollywood north. I went to school for tv/film production. Fell into electronics work, and ran my own production company for years.
@@12voltvids Brilliant !!!! I love watching you work on those real old Akais Sansuis Pioneers etc its my Therapy, A nostalgic type of romance associated with them. They are drawing big bucks on Facebook Marketplace.
@@jamestom2510 big bucks from people that really don't have a clue. I wouldn't spend money on these old units. I get them mostly for free. You know what they say about a fool and his money.
I was looking at my tripod, and another small one that was given to me, and the light bulb went on, and within about 2 minutes I had an overhead crane! The small tripod is solid aluminum, and is just the right size that the 3 legs will wrap around the handle of my existing set of sticks, and a zap strap around the legs and they grip the rubber handle tightly. Works like a charm. Makes a nice jib pole and the head at the other end allows for positioning the camera.I am hopeful that it will support the weight of my pan/tilt unit, as once I get that fixed I can have remote pan and tilt.
12voltvids nice idea! well I already like it, a little bit of old fashioned handy work goes a long way. I think it'll be a good tool to help your viewers along in your circuit bending adventures. love the videos as always and thanks for the reply! ps- will we be able to see your handywork after you get the pan/tilt functionality together?
Yes I will be filming the pan tilt unit disassembly. I is a unique piece that Sony sold 30 years ago. I used to use it in churches to remote my camera up at the front of the church during catholic weddings when they would not allow an operator up front. They would allow a remote camera, so I would put the camera up front and I would be off to the side with a small TV to see what it was shooting.
12voltvids oh nice, I would love to see that, I am always interested in seeing old video production gear, even if it's just a tripod pan/tilt mount. in fact one of my most favorite videos of yours was the Sony single tube projector! what a beauty, and a piece of technical genius, absolutely loved that gear. in fact, I used to have a whole slew of production gear that one of my churches gave me, sadly I was a young kid and I threw most of the stuff away, it consisted of a Sony 3/4ths tape machine, two 3 tube broadcast cameras the size of a guitar case and upwards of 80lbs with lens, power supplies, hundreds of feet of multi-cable as well as a shoulder mount 3 tube camera and an old video mixer. I would've loved to see a UA-camr tear those down or repair/maintain them. :-( but I guess hindsight is 20/20.
Those Power Envelope series are fantastic sounding units. Tons of power. The problem with them was that NAD kept the costs down by manufacturing in Taiwan and using Taiwanese parts. Controls need constant cleaning and it's not a bad idea to re-cap the whole thing with Japanese caps.
Electone_Guy True. I actually liked the non-PE Japanese built units from 84-87 much better, both in terms of reliability and in output. Based on my experience the +6db headroom PE's really lacked in terms of amplifier stability when it came to 3-4 ohm loads compared to their predecessors (7140, 3155, 7155).
I bought a 3240PE brand new in 1988 and still own it to this day. I tortured that thing with 4-ohm KEF C95 towers back in the day that definitely dipped below 4-ohms. Never skipped a beat. I recently re-capped it and use it in my den.
Most of the time bad solder joints are pretty obvious with close inspection. You can see when they separate from the board (ie. if the pad breaks off), or there'll be a ring around the component lead in the solder where the solder has fractured. If you do board level repair long enough, you can spot what's wrong with just a passing glance at the board. A telltale sign of bad solder joints on this receiver is the large brown areas on the PCB, which indicates the board has gotten very hot. Overheating the PCB can cause solder joints to fail from mechanical stress and from burning off the flux left in the solder, making it brittle and prone to cracking. I would have gone the extra mile on this receiver and figure out why those areas of the PCB are overheating. It could have been bad design from the factory, but it could also be failing components causing other parts of the board to run out of spec and get really hot.
I tell you that's a real issue components that generate a lot of heat just as one writer said ... those heating and cooling cycles are murder on solder joints ... not to mention how stressful to the component(s) themselves ... the designers don't really care about keeping power components cool that makes it a throw out for those that don't know how to repair something as simple as a failed solder connection(s) sad really LOL ... I remember the really old stuff had huge heat sinks to remove such heat ... the later stuff NOPE the designers hoped either 1) the user would bring it in for repairs or 2) toss it and buy a new one ... now to the writer that wrote about solder flux .... solder flux is ONLY NEEDED during the actual soldering after that it SHOULD be cleaned away completely ... it is conductive ... and as time passes it becomes even more conductive ... I recently worked on a neighbors reciever (the protection circuit kept kicking in) as it turns out the original solder resin had become so conductive it was tricking the protection circuit in to thinking there was an issue ... very simple solution ... isopropyl alcohol does a wonderful job of breaking down that old resin so it can be flushed away ... it's been weeks now and last time I asked him about his reciever it was functioning just as it should ... I sprayed it let it sit a minute or so and scrubbed it good with a toothbrush spraying more isopropyl alcohol as needed ... turned the circuit board so it could drain off ... and did a final flush spray off ... you wouldn't believe how brown the towel was from the old resin was they used during the manufacturing process (that's another sign if the board your working with had a tan look to it) you can bet that it's old resin and as mentioned earlier it becomes more conductive with age and in sensitive circuits that can become a serious problem causing a major circuit malfunction or random circuit issues such as the protection circuit kicking in ... you get the idea LOL low output from say a pre-amp circuit and so on hope this helps someone who is having trouble figuring out that mysterious electronic issue(s)
They are excellent sounding and very powerful components with +6db of headroom extension. The problem was the low-quality parts NAD used to keep the costs down.
They are kind of like British cars, always electrical problems. I never liked the looks of NAD. The new NAD power amps use Hypex boards, but while say the amp is 200W, 8ohm, it doesn't sound like it has 200W, but more 100 classAB. A few people commented on Hypex and other ClassD boards behaving like this.
NAD, that's a classic receiver that i haven't seen in a long time. Thanks for your videos, I enjoy watching them. And always appreciate the little tips & tricks. Reminds me of days long ago when I did electronics bench repairs. I don't understand why anyone would give a thumbs down, all I can say is the heck with them if they can't take a joke. ;-) I see that you are also a Monte Python fan, they were great.
Where I am there are tons of trees. XM just doesn't work. I had a sub with my car when it was new, but it excluded stern, but did have the other potty mouth channels. Each one trying to outdo the other. I liked Real Jazz, Watercolors and Classic Vinyl, but not enough to pay for it when the 1 year freebee sub ran out. My 128G memory stick with 20,000+ songs on it is more than I will ever be able to hear.
I think your great you tought me alot I have the same nad and it got a dirty left channel balance I'm going to start buy blowing out the balance nob with air and lubricate with channel lub and if that doesn't fix it then I'm going your route thankyou.
thank you for helping with this.. i have a 7100 doing the same and am going to attempt to repair it.. can you tell me what you keep your soldering iron at for temp?... it seems to work much better than mine so I may need a new one..
what a cool video, i have this amp running a set of Dali speakers and on the left channel it crackles and cuts in and out sometimes. Might check like you have show here loved the song, "sit on my face and tell me that you love me" lmao. Good work i hope its just as a simple repair like this one as i would hate to have to replace it. Cant beat the old HIFI gear
Airplanes, lawnmowers, cats, horns, and I thought my neighborhood was noisy.... Just waiting for someone to walk into your garage with a bullhorn and start playing polka. I thought about putting my bench in the garage but eh. Lots more room in there but hot during the summer and especially noisy all year. Edit - also I pretty much always thumbs up your videos so I'm not sure why people would bother doing that or what that's about. I also remember someone telling me on another channel that even if you get thumbs down, it still counts as a rating and pushes your video relevance up, particularly in searches.
I want to put it in the house, but that room now is occupied by my grown kids. Counting the days until they move and clear that room, and then I will move the shop inside. The garage gets pretty warm in the summer, and is cold in the winter. I do have heat in it though so it is bearable.
Don't worry about the thumbs down crowd. They are not well adjusted, and they seek to share their unhappiness. They are irrelevant. Very worthwhile video.
Love my awsome sounding NAD 7155. Replacing some caps on mine now to rid high pitched buzzing sound... Just replaced my Boston Acoustics A400 Caps then re-foamed speakers, was easier then expected.
lol monty python, allways mad and had me glued to the tv for many years :-D. The "Upper class twit of the year show." very silly :-D. The E.q links on the rear panel have caused problems, sitting there for years and never used, the damp gets in and one channel sounds distorted, i've had that. Back sockets in general are troublesome, and the grey fracture line of death on the solder i've seen a lot of.
Hi Dave--great video. I followed your steps to repair my ailing 7240PE but was unable to get the right channel to produce sound again. No amount of tapping, jostling gets that channel to come back, even temporarily, and I resoldered pretty much everything you did on the first board and every joint (yes, every solder joint) on the second board. Any ideas? I can solder and use multimeter but not much past that.
often its that dual-ganged pot that goes out. Did you resolder its' connections to the board? If so, it might be the wipers inside. I've not found a replacement, as it's not a normal potentiometer.
Hi I have a Nad 7250pe , the left speaker channel crackles & sounds windy even with volume turned down to zero, this happens on all sound sources, speakers are good as swapped over, any pointers ? many thanks
Great work! ... but, brother.., your bench is a bit of a mess! How do you manage to find what tool you need? Any case, you seem not to have a problem with that so, all good! Thanks for the video, it's always great to watch a tech at work. Always learning something.
The thumbs down is considered engagement and the youtube algorithm favors it I've heard. So the joke is on them for pressing it lol I've learned how to fix some of my own broken vintage audio gear from watching your channel. Im also a hobbyist electronics buff slowly learning the basics and building up my tools and equipment. An esr meter is my next purchase. Perhaps affiliate links to some of the gear and consumables you use. If not links just the brands would help people like me alot.
Is the problem with a STK4245 Power amp module? sorry my mistake it is discrete, I think you are not the only one that has serviced that NAD Integrated amp.
I have a JVC R-S77 that has a problem in the tuner search system that corrects itself with a tap, I think I shall check the board in that area for bad solder joints.
NAD made their gears not to last by using cheap local perts in Taiwan. When I recapped my used 1020A, wow, OMG, the thing totally slunded different, def'ly better in rez, bass, transparency and at least depth. And that was when the 4 tone circuit caps had not been changed. I am inclined try to recap my 7020 recvrs, 7155's recvrs, 1155 pre, and other old gears just to see them perform closer to original build.
Well you can't please everyone, so who cares if they want to criticize the video. Most of us like your video, myself included. So don't let it bug you. Nice work on this old NAD receiver. I really like NAD stuff.
Dave, Well done. I always learn something when I watch one of your videos. What wattage of soldering iron do you use to resolder those connections? If you have a temperature control, what temperature do you set it to? Love the Monty Python.
Have you considered, that the “thumbs down” might be addressed to the UA-cam algorithm that gives suggestions and not to you? That the user is not interested in the type of content you provide, but that your videos is otherwise fine?
The strange thing is, a thumbs down still is a positive in the UA-cam system, maybe a little less positive than a thumbs up, but still a positive as it shows viewer engagement. What we, the viewers need to remember, and it is easy to forget, is not hitting either button is detrimental. I still remember the star rating system though.
Maybe you fried the amp's power transistors. All AVRs suffer from it when people think it can do 5 or 7 the rated power, say 7ch, 7x110w. Sorry most of them can not, so people please don't crank the volume to loud to prevent clipping. The other problem is the amount heat dissipated by the electronics inside - the little heatsinks just aren't big enough. And finally don't expect them to drive loudspeakers rated below 6-8ohms in multichannel mode, the output transistors and power supply are way too small for that.
Odd to see a NAD amp without output relays. NAD was notorious for using "el cheapo" output relays, which frequently stuck open, causing that channel to cut out. NAD was known for innovative circuit design and high "bang for the buck", but, their manufacturing could be suspect, with a lot of bad (cold) solder joints.
Did you know that you can use the eraser end of a pencil and slightly drag it across the circuit board and help find loose connections a lot quicker.... Try it, it really works... I've been using this method for years...
A new segment to you videos, "name the background noise" I believe I heard, a hoover, a car horn, child(s) screaming car driving by, back up beeper, a lawn mower and a dog barking.... who can top that? Great video. If everyone just asks a friend to "subscribe" 100k can be done!
If everyone became a patron and kicked a buck a month my way I'd be rich, could retire from my day job and do nothing but make videos. Sadly only about 100 actually care about my channel, so it gets plastered with ads. Yes if the patreon experiment had worked there would be no ads on my channel.
I have a right channel that cuts out after about a half hour of listening?? I sprayed DeOxit on all the pots and selectors... Can anyone diagnose given this info?? Really don't wanna sell this :( I have the full stack, 7240PE, 5240 CD PLAYER, and the 6100 Monitor series cassette deck
What is NAD? Spray it with DOxit too. I had an NAD long ago, it was decent little amp. I once had an SAE integrated amp with the same problem as this one here. The repair shop wanted over 100$ to fix it, so I dumped it. Don
NAD was a british company, but they got cheap and moved their manufacturing to Tiawan and the quality took a big dump. They are well designed but the build quality is not was it used to be,
12voltvids They always manufactured in Taiwan/later China though right? They were set up by a group of importers after all and used their contacts over there to keep costs down.
I believe that is correct. They designed in UK, and initially manufactures in Tiawan, and then in China, as the last one I worked on said maid in China on it.
Correct Lenbrook group. Same people responsible for PSB speakers, which is what I have in the shop. They are designed in Canada now. I am not sure where the manufacturing is done as I haven't seen any of the new gear, but it is very highly rated. Lenbrook manufactures their PSB speakers in Canada, so possibly they are building their electronics here.
I think that i have to replace the double potentiometer of the volume/balance knob. Do you know what kind i need and where to order? Great video, much love from the Netherlands! Greetz, Edwin
No no shock or anything, just a flash and bang, but it scared the crap out of me because I wasn't expecting the board to short out against the cabinet. Yes I received your donation. Thanks.
12voltvids it's good to meet a fellow Canuck. I have a Dbx 10/20 that needs servicing and there are no one qualified folks to do the work here. Is this a piece you may be interested in looking at? I noticed that the area around the 4 fuses is darkened but I know that might just be the start. Let me know if this would be a good fit for you. Take care. Rob.
I am mechanical engineer and tape mechanisms are the most difficult things I have faced to repair...make me feel so lazy when I think of them.
Amazing job!!
As always, Your knowledge in electronics is just amazing. You do much more than just troubleshoot. As your soldering and replacing defective components. You take out the schematics and explain how the circuit operates. Which has been a great help to me. Please do not worry about the thumbs down and keep those videos coming!!
As a young..ish tech. As I was often called. I'd like to say that your videos are inspirational to me. I have learned a lot about many things from you in just the last month or so. For that I thank you kindly, I watch several of your videos every day. You're a great tech!
Hi There from a Hi-Fi engineer in the uk over 40 experience years great videos you are doing keep up the great work.
One thing I could add to what is shown here - I recommend to try using a solder sucker when reworking some suspect solder joints. I had a case once where a Yamaha portable multi-track casette deck had a power issue and it turned out the pads of several traces that were supposed to be running to the power transformer had broken off from their traces but were still soldered to the pins. You could not see the separation lines under the solder and flux. Once the solder was sucked away from each pin, the breaks from pad to trace were obvious using an eye loupe. Each pin had to be bridged or jumped over to make a solid connection to its associated trace on the board. Simple reflowing did not work in this case, because the pads that had detached from the board created little islands and were just enough removed from each trace to not allow solder to flow over onto the traces, due to the green solder mask.
Greetings from New Zealand, Dave. Great work and repair, as always. New camera aspect is appreciated by us all. Keep up with these videos, I'm learning a lot.
Like the new view! I always enjoy the stereo repairs the most. Thanks for sharing. I really appreciate it.
The nice thing about having the camera on a jib is I can still use it for regular shooting without changing it. If I am working on a TV, I can have it over the bench looking at the TV from an angle rather than at my back.
Love the background sounds in your videos!! When the dog howled, both my dogs pricked up their ears and started looking around!
Thank you very much. I decided that I am going to learn how to repair amplifier after watching this video. This video gives me confidence and i really enjoy watching the process of repairing it. This video is the best ever.
very nice, I like the new camera setup as well. Thank you.
always Excellent diagnostics and rectification.
I have the same issue in an old "work shop" receiver. It's been through hell. Great video - don't worry about haters. Thank you for your time and insight.
Those are nice units. You do great work as always. Enjoy the videos.
Stick your horn........fantastic!Aniway ,your analysis of the things you repare are very educational.Thanks and keep up the good work!
OMG you scared me with that tapping explosion: 12:41am. Wide awake now.
Scared you! He, I dam near crapped myself. I thought my speaker turned itself inside out for a second.
It is so nice to see a piece of modern equipment that has a bottom cover so you can take off to get to all of the PCB's
This was made in 1989
well done, ive owned the 3240pe integrated amp and now have the seperate 1240 and 2240 pre and power amps, excellent sound from NAD as always :-)
Well done for hitting 20k subs
20K and counting
You are an inspiration keep doing what you do you are brilliant.
These are very nice amps. I still have one of these on sub duty, power amp only. The dynamic power is increddible on these. RMS power is only 90 Watts per channel on four Ohms, dynamic however is near fourhundred capable of killing my subs. Love the amp to bits
Yeah the overhead view is great, there was a nice flash at 4:08! So happens I have been listening to you on a NAD 2400 monitor amp that a friend found on the street and gave to me. The 2400 does have a protection circuit... and that was the problem! Had a bad capacitor and by co-incidence the output transistor bias was also off by enough to trigger the protection circuit. I only fixed it thanks to a post on a forum about amplifiers, saying to check the bias and replace that capacitor, wish I could remember where that was.
www.hifiengine.com/manual_library/nad/7240pe.shtml ?? perhaps?
pretty nice job as always can’t wait to see another great repair video from your excellent channel keep it up my friend and thank you for keeping vintage alive
Waching you work on these devices is very relaxing
Stressful for me. One wrong move and pop it goes.
Love your informative videos. I see you also use the famous Tenerol 2001 cartridge. Sounds warm and full bodied ;-)
You and you're electronics are well connected .. sparks flying by >.< nice vid
welll not only are you very wise and talented and knowledgable you are very creative as well with a camera mounting bravo I have a theory about when people purchase from places like ebay or amazon that if they drop the package hard to the ground it might be possible to losten connections on the circuit boards . I learn something from you all the time have a great night and est of your week
Great !!!... as usual, nice sharing this
Best regards from Nice-France, overseas....
Same here, from France.
Nice job as always. On this one though I'd suggest the first step should have been to pull the pre-out/main-in jumpers and substitute a patch cable, with the L/R channels crossed. That would immediately cut the problem in half. (Right channel cutting out now? Problem is on the preamp side. Left channel still cutting out? It's on the power amp side.) On the other hand it's good that you reworked connections on both sides, and found the too-long pins, and if staying on one side of the unit would have made me miss those, then that's a point against me. :-) Thanks for all the vids.
Got to say I have only recently stumbled across your channel. I love it :) Very interesting and informative especially for a fumbling old duffer like me who is trying to learn about electronics. Ok, I'm not really so old at 54 but the health problems I have make me feel that way. Enough of that self pitying crap! Well done on an excellent channel and to hell with those who insist on giving you a thumbs down :( They can stick their thumbs where the sun doesn't rise, to pinch your phraseology ;) Cheers.
Refreshing to see a tidy work bench...😎
organized chaos
@@joeygonzo I always warn the missus- never tidy my bench thinking you're doing me a favour, you'll just mess up the "filing system" that's in my head. It also makes things more difficult for potential thieves since they can't tell what's worth nabbing and what's junk lol
don't understand the dislikes, I used to manage a shop, and watching you work I have no complaints. I would have bee happy to have a tech like you working for us.
They are the trolls
You know losers that have no other purpose in life but to dislike videos, sit on their ass collecting welfare and cause cival disobedience with protests over anything and everything. They are pests just like termites and carpenter ants and they should be treated so such.
The most awesome channel. Thank you.
Great stuff. I remember wanting to be a electronic technician when i was young but wasnt allowed pursue that career, parents had other thoughts, fast forward 35 years and im doing this as a hobby........especially great during lockdown. Love your vids....
I never wanted to do it. I wanted to go into the broadcasting business but my mother wanted nothing if that. Her friends husband did that and was regularly out if work. That was before the big explosion of film and TV here in Hollywood north. I went to school for tv/film production. Fell into electronics work, and ran my own production company for years.
@@12voltvids Brilliant !!!! I love watching you work on those real old Akais Sansuis Pioneers etc its my Therapy, A nostalgic type of romance associated with them. They are drawing big bucks on Facebook Marketplace.
@@jamestom2510 big bucks from people that really don't have a clue. I wouldn't spend money on these old units. I get them mostly for free. You know what they say about a fool and his money.
Great video! Thanks for posting it.
awesome work my friend! I like the new filming improvements!
I was looking at my tripod, and another small one that was given to me, and the light bulb went on, and within about 2 minutes I had an overhead crane!
The small tripod is solid aluminum, and is just the right size that the 3 legs will wrap around the handle of my existing set of sticks, and a zap strap around the legs and they grip the rubber handle tightly. Works like a charm.
Makes a nice jib pole and the head at the other end allows for positioning the camera.I am hopeful that it will support the weight of my pan/tilt unit, as once I get that fixed I can have remote pan and tilt.
12voltvids nice idea! well I already like it, a little bit of old fashioned handy work goes a long way. I think it'll be a good tool to help your viewers along in your circuit bending adventures. love the videos as always and thanks for the reply! ps- will we be able to see your handywork after you get the pan/tilt functionality together?
Yes I will be filming the pan tilt unit disassembly. I is a unique piece that Sony sold 30 years ago. I used to use it in churches to remote my camera up at the front of the church during catholic weddings when they would not allow an operator up front. They would allow a remote camera, so I would put the camera up front and I would be off to the side with a small TV to see what it was shooting.
12voltvids oh nice, I would love to see that, I am always interested in seeing old video production gear, even if it's just a tripod pan/tilt mount. in fact one of my most favorite videos of yours was the Sony single tube projector! what a beauty, and a piece of technical genius, absolutely loved that gear. in fact, I used to have a whole slew of production gear that one of my churches gave me, sadly I was a young kid and I threw most of the stuff away, it consisted of a Sony 3/4ths tape machine, two 3 tube broadcast cameras the size of a guitar case and upwards of 80lbs with lens, power supplies, hundreds of feet of multi-cable as well as a shoulder mount 3 tube camera and an old video mixer. I would've loved to see a UA-camr tear those down or repair/maintain them. :-( but I guess hindsight is 20/20.
Those Power Envelope series are fantastic sounding units. Tons of power. The problem with them was that NAD kept the costs down by manufacturing in Taiwan and using Taiwanese parts. Controls need constant cleaning and it's not a bad idea to re-cap the whole thing with Japanese caps.
Electone_Guy True. I actually liked the non-PE Japanese built units from 84-87 much better, both in terms of reliability and in output. Based on my experience the +6db headroom PE's really lacked in terms of amplifier stability when it came to 3-4 ohm loads compared to their predecessors (7140, 3155, 7155).
I bought a 3240PE brand new in 1988 and still own it to this day. I tortured that thing with 4-ohm KEF C95 towers back in the day that definitely dipped below 4-ohms. Never skipped a beat. I recently re-capped it and use it in my den.
Agree, they used really cheap capacitors. Some people have had them blow up.
non Pe lover here too , I still have my original Nad 2155 power amp I bought in 1984 new , and will pass it on when I`m gone lol ... :)
Huh, those cracked solder joints are difficult to find. Good job as always! :)
Most of the time bad solder joints are pretty obvious with close inspection. You can see when they separate from the board (ie. if the pad breaks off), or there'll be a ring around the component lead in the solder where the solder has fractured.
If you do board level repair long enough, you can spot what's wrong with just a passing glance at the board.
A telltale sign of bad solder joints on this receiver is the large brown areas on the PCB, which indicates the board has gotten very hot. Overheating the PCB can cause solder joints to fail from mechanical stress and from burning off the flux left in the solder, making it brittle and prone to cracking.
I would have gone the extra mile on this receiver and figure out why those areas of the PCB are overheating. It could have been bad design from the factory, but it could also be failing components causing other parts of the board to run out of spec and get really hot.
Thanks for information!
I tell you that's a real issue components that generate a lot of heat just as one writer said ... those heating and cooling cycles are murder on solder joints ... not to mention how stressful to the component(s) themselves ... the designers don't really care about keeping power components cool that makes it a throw out for those that don't know how to repair something as simple as a failed solder connection(s) sad really LOL ... I remember the really old stuff had huge heat sinks to remove such heat ... the later stuff NOPE the designers hoped either 1) the user would bring it in for repairs or 2) toss it and buy a new one ... now to the writer that wrote about solder flux .... solder flux is ONLY NEEDED during the actual soldering after that it SHOULD be cleaned away completely ... it is conductive ... and as time passes it becomes even more conductive ... I recently worked on a neighbors reciever (the protection circuit kept kicking in) as it turns out the original solder resin had become so conductive it was tricking the protection circuit in to thinking there was an issue ... very simple solution ... isopropyl alcohol does a wonderful job of breaking down that old resin so it can be flushed away ... it's been weeks now and last time I asked him about his reciever it was functioning just as it should ... I sprayed it let it sit a minute or so and scrubbed it good with a toothbrush spraying more isopropyl alcohol as needed ... turned the circuit board so it could drain off ... and did a final flush spray off ... you wouldn't believe how brown the towel was from the old resin was they used during the manufacturing process (that's another sign if the board your working with had a tan look to it) you can bet that it's old resin and as mentioned earlier it becomes more conductive with age and in sensitive circuits that can become a serious problem causing a major circuit malfunction or random circuit issues such as the protection circuit kicking in ... you get the idea LOL low output from say a pre-amp circuit and so on hope this helps someone who is having trouble figuring out that mysterious electronic issue(s)
They are excellent sounding and very powerful components with +6db of headroom extension. The problem was the low-quality parts NAD used to keep the costs down.
They are kind of like British cars, always electrical problems. I never liked the looks of NAD. The new NAD power amps use Hypex boards, but while say the amp is 200W, 8ohm, it doesn't sound like it has 200W, but more 100 classAB. A few people commented on Hypex and other ClassD boards behaving like this.
NAD, that's a classic receiver that i haven't seen in a long time.
Thanks for your videos, I enjoy watching them. And always appreciate the little tips & tricks. Reminds me of days long ago when I did electronics bench repairs. I don't understand why anyone would give a thumbs down, all I can say is the heck with them if they can't take a joke. ;-)
I see that you are also a Monte Python fan, they were great.
Howard Stern has his stare of haters too, and they still listen every day.
I was just thinking the same - that must be a fair age! I remember selling those when they were the latest model.........
Where I am there are tons of trees. XM just doesn't work. I had a sub with my car when it was new, but it excluded stern, but did have the other potty mouth channels. Each one trying to outdo the other.
I liked Real Jazz, Watercolors and Classic Vinyl, but not enough to pay for it when the 1 year freebee sub ran out. My 128G memory stick with 20,000+ songs on it is more than I will ever be able to hear.
Love vintage NAD equipment.
as per Monty P Always look on the bright side of life well done my friend!
They give you a thumb down and think they know you i think your videos are fine and helpful.
cool,whe had some fire works there,haha, good job bro,alway's good vids from you,have a nice weekend
Nice work!
Excellent, like always!
I think your great you tought me alot I have the same nad and it got a dirty left channel balance I'm going to start buy blowing out the balance nob with air and lubricate with channel lub and if that doesn't fix it then I'm going your route thankyou.
thank you for helping with this.. i have a 7100 doing the same and am going to attempt to repair it.. can you tell me what you keep your soldering iron at for temp?... it seems to work much better than mine so I may need a new one..
what a cool video, i have this amp running a set of Dali speakers and on the left channel it crackles and cuts in and out sometimes. Might check like you have show here loved the song, "sit on my face and tell me that you love me" lmao. Good work i hope its just as a simple repair like this one as i would hate to have to replace it. Cant beat the old HIFI gear
Monty Python is a classic!
*THUMBS UP 👍
Airplanes, lawnmowers, cats, horns, and I thought my neighborhood was noisy.... Just waiting for someone to walk into your garage with a bullhorn and start playing polka. I thought about putting my bench in the garage but eh. Lots more room in there but hot during the summer and especially noisy all year.
Edit - also I pretty much always thumbs up your videos so I'm not sure why people would bother doing that or what that's about. I also remember someone telling me on another channel that even if you get thumbs down, it still counts as a rating and pushes your video relevance up, particularly in searches.
Yes correct. It doesn't matter what way they vote.
I want to put it in the house, but that room now is occupied by my grown kids. Counting the days until they move and clear that room, and then I will move the shop inside. The garage gets pretty warm in the summer, and is cold in the winter. I do have heat in it though so it is bearable.
Dry joints account for so many faults in my experience. Nice work and well explained.
Don't worry about the thumbs down crowd. They are not well adjusted, and they seek to share their unhappiness. They are irrelevant.
Very worthwhile video.
I own a NAD 7155 stereo receiver, and I give you a thumbs up. Great work...!
Love my awsome sounding NAD 7155. Replacing some caps on mine now to rid high pitched buzzing sound... Just replaced my Boston Acoustics A400 Caps then re-foamed speakers, was easier then expected.
I have the same unit and both 4a fuse and 5a fuse keeps blowing and I can't seem what it is
lol monty python, allways mad and had me glued to the tv for many years :-D.
The "Upper class twit of the year show." very silly :-D.
The E.q links on the rear panel have caused problems, sitting there for years and never used, the damp gets in and one channel sounds distorted, i've had that.
Back sockets in general are troublesome, and the grey fracture line of death on the solder i've seen a lot of.
Hi Dave--great video. I followed your steps to repair my ailing 7240PE but was unable to get the right channel to produce sound again. No amount of tapping, jostling gets that channel to come back, even temporarily, and I resoldered pretty much everything you did on the first board and every joint (yes, every solder joint) on the second board. Any ideas? I can solder and use multimeter but not much past that.
often its that dual-ganged pot that goes out. Did you resolder its' connections to the board? If so, it might be the wipers inside. I've not found a replacement, as it's not a normal potentiometer.
Hi I have a Nad 7250pe , the left speaker channel crackles & sounds windy even with volume turned down to zero, this happens on all sound sources, speakers are good as swapped over, any pointers ? many thanks
Great work! ... but, brother.., your bench is a bit of a mess! How do you manage to find what tool you need?
Any case, you seem not to have a problem with that so, all good!
Thanks for the video, it's always great to watch a tech at work. Always learning something.
sounding good
The thumbs down is considered engagement and the youtube algorithm favors it I've heard. So the joke is on them for pressing it lol I've learned how to fix some of my own broken vintage audio gear from watching your channel. Im also a hobbyist electronics buff slowly learning the basics and building up my tools and equipment. An esr meter is my next purchase. Perhaps affiliate links to some of the gear and consumables you use. If not links just the brands would help people like me alot.
I have a NAD 7140 with FM receiving I will try your trouble shooting trick on that thanks for Video
Is the problem with a STK4245 Power amp module? sorry my mistake it is discrete, I think you are not the only one that has serviced that NAD Integrated amp.
How do you like the sound of this amp?
I like the overhead view
great video
I have a JVC R-S77 that has a problem in the tuner search system that corrects itself with a tap, I think I shall check the board in that area for bad solder joints.
NAD made their gears not to last by using cheap local perts in Taiwan.
When I recapped my used 1020A, wow, OMG, the thing totally slunded different, def'ly better in rez, bass, transparency and at least depth. And that was when the 4 tone circuit caps had not been changed.
I am inclined try to recap my 7020 recvrs, 7155's recvrs, 1155 pre, and other old gears just to see them perform closer to original build.
the monty python bit was worth a thumbs up all on its own :)
No matter what i've always clicked like on your video's
Thanks. We have to keep the trolls in check. The ratio of up vs down is what matters.
I used that tap tap method before to find faults.
I'd love to see the tripod zip tied to another tripod. Good fix BTW, as simple as bad solder joints
Well you can't please everyone, so who cares if they want to criticize the video. Most of us like your video, myself included. So don't let it bug you. Nice work on this old NAD receiver. I really like NAD stuff.
9:00, a tap for 240 Volt use
Dave,
Well done. I always learn something when I watch one of your videos. What wattage of soldering iron do you use to resolder those connections? If you have a temperature control, what temperature do you set it to?
Love the Monty Python.
I believe it's 60 watts.
@@12voltvids Thanks Dave.
Why do you worry about people thumbing down your video's? No need to talk about it!
I don't worry about it. I laugh about it. Why do you think I am poking fun at them here.
I counter act your thumbs down with a thumbs up!
It kinda sounded like you did care though, which sadly only fuels trolls to do it more.
Have you considered, that the “thumbs down” might be addressed to the UA-cam algorithm that gives suggestions and not to you? That the user is not interested in the type of content you provide, but that your videos is otherwise fine?
The strange thing is, a thumbs down still is a positive in the UA-cam system, maybe a little less positive than a thumbs up, but still a positive as it shows viewer engagement. What we, the viewers need to remember, and it is easy to forget, is not hitting either button is detrimental. I still remember the star rating system though.
thumbs up mate great vieos
Soldier wave machines were hard to set up, either to much or not enough heat. I seen them burn the boards
Hello have a question. I have a denon avr-4810ci and it turns on then powers off
Maybe you fried the amp's power transistors. All AVRs suffer from it when people think it can do 5 or 7 the rated power, say 7ch, 7x110w. Sorry most of them can not, so people please don't crank the volume to loud to prevent clipping. The other problem is the amount heat dissipated by the electronics inside - the little heatsinks just aren't big enough. And finally don't expect them to drive loudspeakers rated below 6-8ohms in multichannel mode, the output transistors and power supply are way too small for that.
Good vid, why the hell didnt NAD use a sheet of protective plastic insulation, that whole board seems stupidly close to the baseplate, wow.
👍big thumbs up ...NAD S ... stands for Not All Done Soldering!
Have had many of these over the years with same problem.
Do you think that thump we heard when you powered on the receiver could cause any damages to the speaker?
They all do this.
@@12voltvids thanks a lot
I appreciate yr comment on the thumbs downer folks....
Odd to see a NAD amp without output relays. NAD was notorious for using "el cheapo" output relays, which frequently stuck open, causing that channel to cut out. NAD was known for innovative circuit design and high "bang for the buck", but, their manufacturing could be suspect, with a lot of bad (cold) solder joints.
LOL just before that happened I was thinking to myself whenever I'm tap testing some5 always use the rubber end of a screwdriver
When soldering the circuit board, what temperature is the iron set to?
700 to 725F
No plastic protective sheet on that bottom sheet like car radios have
Nice going
Did you know that you can use the eraser end of a pencil and slightly drag it across the circuit board and help find loose connections a lot quicker.... Try it, it really works... I've been using this method for years...
A new segment to you videos, "name the background noise" I believe I heard, a hoover, a car horn, child(s) screaming car driving by, back up beeper, a lawn mower and a dog barking.... who can top that? Great video. If everyone just asks a friend to "subscribe" 100k can be done!
If everyone became a patron and kicked a buck a month my way I'd be rich, could retire from my day job and do nothing but make videos. Sadly only about 100 actually care about my channel, so it gets plastered with ads.
Yes if the patreon experiment had worked there would be no ads on my channel.
I have a right channel that cuts out after about a half hour of listening?? I sprayed DeOxit on all the pots and selectors... Can anyone diagnose given this info?? Really don't wanna sell this :( I have the full stack, 7240PE, 5240 CD PLAYER, and the 6100 Monitor series cassette deck
Monty is cool 😎 one of the monty crew knew lemmy. My favourite channels in no order are 12voltvids techmoan and britech09
What is NAD?
Spray it with DOxit too.
I had an NAD long ago, it was decent little amp.
I once had an SAE integrated amp with the same problem as this one here.
The repair shop wanted over 100$ to fix it, so I dumped it.
Don
NAD was a british company, but they got cheap and moved their manufacturing to Tiawan and the quality took a big dump. They are well designed but the build quality is not was it used to be,
12voltvids They always manufactured in Taiwan/later China though right? They were set up by a group of importers after all and used their contacts over there to keep costs down.
I believe that is correct. They designed in UK, and initially manufactures in Tiawan, and then in China, as the last one I worked on said maid in China on it.
Is NAD still around? They were premium quality.. back in the late 70s.. or early 80s.
Michelle Pucca Yeah, owned by a Canadian company now. Still producing good stuff.
Correct Lenbrook group. Same people responsible for PSB speakers, which is what I have in the shop. They are designed in Canada now. I am not sure where the manufacturing is done as I haven't seen any of the new gear, but it is very highly rated. Lenbrook manufactures their PSB speakers in Canada, so possibly they are building their electronics here.
I think that i have to replace the double potentiometer of the volume/balance knob. Do you know what kind i need and where to order?
Great video, much love from the Netherlands! Greetz, Edwin
Sorry I don't know the value or where you can get it.
No problem, i guess i'll have to find out myself. Thank you for responding so quick, i really appreciate that!
@@12voltvids
Nice bang there around 4:14 :P Did you feel anything from it? Thanks for a new nice video :) Ihope you got my donation.
No no shock or anything, just a flash and bang, but it scared the crap out of me because I wasn't expecting the board to short out against the cabinet.
Yes I received your donation. Thanks.
It did scare me a bit to.
Good taiwanese made amp, not bad performers
can anyone tell me what is the music @ 27:43?
It is musicbakery royalty free. Track is called class of 69.
@@12voltvids Thanks a lot. Love your videos. You really seem to know your business.
I would of put a piece of rubber pad on top[ of the old one but...For the one that gave you a thumb down , I gave you a thumb up.
seem to have allot of problems with chanels (im stating that left chanel is comon to go out)
That looks like a Mastercraft screw driver and tuned in to a Jay's game. Are you a Canuck?
I am in Canada, but I doubt that I bought that screw driver at Canadian Tire.
@@12voltvids lol. I'm in kitchener ont. Nice to know you. Just started watching your videos.
@@robpeters5204
I'm out west. Just south of Vancouver along the Canada USA border.
We don't get the brutal winters that the rest of you do.
12voltvids it's good to meet a fellow Canuck. I have a Dbx 10/20 that needs servicing and there are no one qualified folks to do the work here. Is this a piece you may be interested in looking at? I noticed that the area around the 4 fuses is darkened but I know that might just be the start. Let me know if this would be a good fit for you. Take care. Rob.