You can't say you didn't try, I would have given up when I found that that IF can was bad. My 70 years old eyes can't see small stuff anymore. Thank for the videos.
Only managed to get 30mins in and got to get some sleep, but you've surpassed yourself on this one man. This coil rewinding microsurgery even beats some of your yoke and flyback surgery grafts i recall. Twoobly snoybler.
As I always say, YOU ROCK! Not Boring. No Way will I ever get to see anything like this. I loved this video and learned a lot. Wow how many can say they've rewound an IF Transformer.
They say that a high level of technology is indistinguishable from magic, the repair of the transformer looks like magic or as you stated love! Very interesting repair! Watching you save these lost souls is indeed inspirational! Much better than golf and if I dare watch any news, your videos are contrastingly therapeutic. Please keep sharing!
I like the way you think. Cool to watch all of this, especially since it was made the year I was born. Interesting to see you rewind that can and it worked! Glad you had the patience to get it working good enough in my opinion. Thanks for sharing your time and trouble to do these videos! Cheers! 🍻 from N.C., USA -Big Al
Been waiting for this one. I can hear the agony in your voice. Very frustrating indeed. I don't believe I've ever seen one beat you yet and I'm sure you just need a break from it. Whatever the outcome.. this has been a great series of videos with a ton of whimsical anecdotes and at times savage humor. Thanks for your contributions of knowledge and humor throughout this project. =)
Really like old CRT console tv’s like Penncrest, Magnavox, and Zenith, even if they’re particleboard. It’s a real plus if it has an AM/FM radio 📻 and a record player. Yes, 1970’s, but it’s what I knew. Just the sound of a console, such as in an empty 🏡 house. It’s more than just deep bass. I’ve seen your videos on it. The bright color CRT, the glow of the radio 📻 dial at night, and the ghosting of two radio 📻 stations on top of each other. Radiotvphononut has a similar video of the dial light 💡 on his Astro-Sonic console in his basement with the lights off. I ❤️ love these consoles. The glass radio dial, dial cord complexity. I have an Astro-Sonic console my mom bought me back in 2010 for my birthday 🎂 for $147.00 at Salvation Army. Western Auto, a common product marketed by them. Seen them at the Western Auto in Glennallen Alaska in 1978. Yes, about $380.00, but they were like your first luxury car 🚗 for your living room. That’s my opinion.
Nice work Shango! The active power filter is sometimes called a capacitance multiplier. The idea is identical to a voltage regulator where a small capacitor filter circuit is used to regulate a higher current output by using the current amplification of the a pass transistor to do the work. BTW, there are a whole bunch of films in the public domain which may be of more interest than informericals. A list of which can be found on Wikipedia, and copies of some of the films can be found on the internet archive.
I say you did a helluva job for what it was. I can understand being frustrated at trying to get something to work the way it should. Quite an epic series!
thanks for taking the time and making the effort to make and upload this. both for the repair and the adverts it gives a window on a country I hear so much about but no so little of.
I am kind of forced to display the worst of the worst content on the subject television due to copyright flagging. Please Don't Judge my country on the consistency of our stool
@@shango066 i don't know enough to judge but perhaps stool consistency is as good a measure of any or at least how concerned the advertisers think the population should be about it.
I like watching both TV IF alignments, AND golf! Color me weird... 😝 IF alignment, or any bandwidth pass or limit filter alignment is tough under the best of circumstances, and having to do this transformer repair and then realign --- FANTASTIC JOB!! ♥️ I was getting the heebie jeebies just watching you work with those microscopic wires!
I like how you push that dip completely out of the waveform on the scope...and whalla...! The band pass shows up. That’s some slick moves. Meanwhile, I’d be messing with the traps to get rid of that dip on 45 MHz. You are gooooood !
Shango you are a legend, really interesting stuff... I love your commentary over the toilet burgerage infomercial broadcastalations. Oh I know this is an old video but regarding the regarding the 60Hz display noise bar-age, I would have replaced the whole circuit with a modern voltage regulator and a couple of caps. Germanium power transistor circuits are well I think are a bit of a dark art. keep up the good work.
Yes, to make it work is certainly a goal. Another goal is that its like working on a puzzle. It's both satisfying and frustrating, but the mental exercise is stimulating.
Great video as always. I appreciate the dedication and your time. I’d rather watch your channel vs. golf any day! I think bulk recap is the easiest way for a beginner to feel like they are repairing something. It’s a lot like my trade where I see customers try to repair their car by replacing parts based on what the internet experts tell them. Unfortunately both are met with frequent disaster.
Sorry for the unfortunate outcome shango. No I'm not gonna comment on the green jacket lol Great videos as always, your one of a few people I love to watch/listen too repairing old crts. P.s bust out the Sony
Shango, you're one of the channels that I keep watching regularly this Summer. Your voice sounds a lot like a friend I had in the 90s, a Mr. Dan(a) Hubble, of Winnipeg, Canada. He too was into electronics repair. He was considered the BEST CBer in all of Winnipeg. The Department of Communications would drop by now and then to check that he was running "legal power" on the CB. He used to go to Princess Auto to get electronics parts and also another place I can't remember. He told me all about Pentium CPUs. He was an avid listener of Coast to Coast (Art Bell). Was into WinAmp. When I met him in 1995 he got a copy of Adobe Photoshop. I told him that I couldn't afford Photoshop but that a new programme for Linux (GIMP) did the same thing but for FREE. I miss Dan.
Unless the caps are bad, there is no point replacing them. Some would say whats the point restoring vintage computers. The point is both of us are restoring & preserving our technological histroy that would be lost if we did not.
Delco made some of the best power transistors in the 60s and early 70s. I still have some Westinghouse germanium power transistors in that package and a home made 1957 power supply that uses them.
You should be able to replace the IF transformer with any LC combination that is tuned to the correct frequency, ie most of them. It is a matter of finding one that can be fitted without dangling in the wind...
@ab5ni Yes that was a dumb statement. You know I knew it was wrong as I wrote it. Still shouldn't be impossible to find a close match...was probably my intent.
Great vididio! I always thought that the A.P.F. effect was amplifying the filter cap. I ain't touched nothing like that in over 30 years. Shango you are the master.
That arrangement is called a "capacitance multiplier" they're using a sziklai pair (like darlington but with a NPN and PNP) as the pass transistor. Basically it filters the input voltage through the 560-5600 divider and C1 and uses that as the "reference" voltage instead of a zener. Pretty smart and effective where regulation isn't required but filtering is. The output voltage should be less than the input if it's working, did you check the voltages? Might also be a loose connection on C1 or a bodge wire shorting something it shouldn't.
@@atomicpunk Lol, not really, just lots of time reading theory about class-AB amps on the internet, mostly sound.whsites.net . EEVblog did a video on the cap. multiplier: ua-cam.com/video/wopmEyZKnYo/v-deo.html
Yeah it's all working. The voltages are correct the Ripple looks correct. The lack of Regulation and the fluctuation in the picture from the audio amp load variations is the most annoying thing. maybe this is just the way it operates. I don't see any real effective form of Regulation
@@shango066 the corner frequency of 560ohms and 1000uf is 0.28Hz. Anything above that should be pretty much gone (like 60hz), below that it passes it straight through (like DC, that's why there's no regulation, this isn't a regulator). I'd take a look at the input and output rails with a scope. Possibly the input has too much ripple or the transistors don't have enough gain to supply the output so when the load draws a current spike it drops out. Since you replaced X25 possibly X24 has a low hFe, I'd try replacing it just to eliminate it. Be careful with the orientation, this is a PNP so E goes towards the input and C towards output.
Jernej beat me to it! I would put a scope on the base of the NPN and the output of the capacitance multiplier. The hint about a poor connection to C1 seems like a good one. This is not a true regulator circuit; it is just meant to smooth out short-term voltage fluctuations.
Another great video! Love you analogy towards the end, rather buy a "virgin" and mess it up yourself. Reminds me of the yeas working on commercial two way gear, someone would always try and bring me a CB that quit working. I always sent them on their way, gads knows what one would find in there. It was bad enough working on one individuals radios, full of roaches and roach egg sacks. Would let them sit for a week in a fumigation box. Another nightmare was repairing pagers or beepers as some would call them. You could always smell the ones that wound up in the urinals. Refused to repair them, a major health hazard, its real easy to scratch oneself on those sharp wires on the back side.
nice, ya know at 12:18 ( showing PCBA solder side ) just to the right of that L9 IF Xformer, i would touch up that solder joint connection that's going to pin 1 (or 4) of L9 . . . Cheers
Even this TV has a Local / DX switch. This seemed to be as important of a feature on most radios of the era as having "DELUXE" emblazoned on the faceplate!!
I'd be tempted to replace C37 with a higher value electrolytic like 470uF to see what happens. In 1966, capacitors of 470uF were much larger and much more expensive than they are today, so I wouldn't be surprised if it cured the problem. The engineer who designed this area of the TV probably wanted to put in a larger electrolytic in, but his boss said we're over budget if you put that in, the performance is "good enough".
Use your variable DC supply and sub that voltage in, maybe the problem isn't in the power supply? Good Video, you worked on it longer than I probably would have lol
Your persistence is most impressive. You know when you have to take a break from it before you become a danger to it! Can a video tuner EVER get all of the vertical lines on the resolution test pattern to show on the best monitor? Although my expertise is more on the mechanical (VTR) side of things, I know others would have condemned that tuner as a basket case. In a VTR I owned I tried to loosen a partially pre-destroyed inductor/choke slug and felt one wire pop, realized what happened and then gave it some real torque.
Talking about patients what about cataracts I’ve had it take so long to get off so much careful attention to it and then the lens pop off and fall on the ground and shatter. A lot of the soldering work aside from capacitor changes are crazy small or delicate especially on solid state stuff. So many times I’ve wanted to throw stuff out the window which another thing I absolutely hate to work on is phonograph cartridges with the pins breaking easily or putting new wires on if you have ever had to do an rca rp190 cart replacement.
I have one of those testers and the clamp block on mine has gone bad. It no longer recognizes any thing I plug into it. It had solder pads I was able to attach wires with clips to and that works well. I don't know how good those clamp blocks are generally but mine was junk.
Wonder if kicking down the signal out of the DirecTV or converter box with an inline 75 ohm attenuator would solve the overmodulation/ not enough gain issue with the local and DX switch.
I have found signals from converters sometimes work better when passed thru a VCR and then to the TV. I may work on something more portable sometime. You may try a VCR etc in line sometime.
Those Japanese Toko branded transformers were actually commonly found in later 1970s and 1980s electronics. You can still purchase NOS ones right on eBay if you ever decide to change them out.
The “active filtering” is a type of Darlington pair. If you deactivate that ckt, and find how that rail is being energized, you’ll find the ripple issue …
At 1:02:00 is that the regulation for the 12 volt section ? This TV can run on a 12 Volt source. That being said...it would do nothing for the 60Hz noise from mains power. If I’m wrong, I’ll admit it. Just a thought I had....
Cores out of a 455khz if won't work at all in a 45mhz IF coil, but cores out of a 10.7mhz IF might. I commented in your last video that you could build a replacement coil by winding one on a small toroid core, either a T30-10 or a T37-10 should work, with about 15 turns tapped at 5 turns for the ground. Tune it with a small (30pf) trimmer cap. Toroids can be obtained from kitsandparts.com.
I totally agree with you, maybe 10 windings (5mm diameter, winding on winding) will fit für the resonant circuit (depends of the C of course, that is about 20pF here, see shematic..) and 3 für the neutralisation-feedback... In the original filtercoil there were only one for the neutral. feedback and 3...5 for the resonant circuit, as far as I rem. ... It can be experimentally determined, perhaps with "flying" air-core-coils and trimmer. If only this coil is not shielded, ist will probably not make problems with unwanted oscillating of the if-amp.
@ab5ni It's just another tank(parallel LC) circuit. if you go by this formula of f = 1/(2*pi*sqrt(L*C)). You should be about to mix and mach both a coil and cap to get what you need.
I get such a kick out of how you comment on the commercials ! In this one...the way you do the whole..”duuuur dee duurrrrr” on the guy selling the fryer. I’ve seen that commercial. He’s a bleach blonde surfer dude from L.A. ( No offense Shango, I know you too are from L.A.) I just couldn’t help but bust a gut when you did that !
@ 53:39 - Stacey Herbert shore haz a purdy mouf! I be luv me some Max & Stacey! @ 1:02:35 - How much ripple have you got at point 105 - top of C1 1000 mike. I once drove out to my dad's house to change main filter cap in a Sony - turned out it wasn't main filter, had to make second trip to replace small electrolytic on base of regulator driver transistor. I also had a small 5" Sony B&W AC/12 volt power - didn't have the ripple, but horiz width fluctuated with audio power. Like you I replaced the Selenium bridge with silicon - no luck. This set didn't have a regulator circuit. I installed a 7812 regulator - fixed it right up. No sweep width variation with full blast audio.
That circuit is a capacitance multiplier to filter ripple out . Old Germaniums go back quite often. These can be replaced with silicon. The filter caps maybe bad too. Too bad you dont use a scope . would have made it very easy to check ripple
You can fix that IF transformer. I wind my own inductors, just save the core (hopefully its not frozen), bend up the 4 tabs on the bottom, the magnet wire was open I just soldered it but you can rewind it especially if you have an lcr meter
The power regulator is a Szicklai pair and is operating as an emitter follower, the big transistor looks to the circuit like the little driver. I was surprised to see this as it was only invented in about 1960. EDIT a resistor and 12V zener divider between base and collector of the Zicklai (Emitter of big one and bass of little one) would make it a proper regulator.
was it Sears, or just Craftsman tools, if it is broken, bring it back for another, just like zippo lighters~ (did work on the zippo manufacturing machinery in 1986~ bradford, PA
I believe you connected the windings of the coil wrong, but I could not see it clearly. From the circuit board layout it seems the ground is at the corner pin of the coil and not the middle pin. I believe I saw you connect the tap point to the center pin, which would be wrong.
Im sorry but im glad my shiny new transistor just comes in a plastic bag.. probably at 10 for a dollar too.. that germanium transistor in a box wouldn't have been cheap in its day brand new
I rarely watch these long videos but something about YOUR videos is just mesmerizing.
You can't say you didn't try, I would have given up when I found that that IF can was bad. My 70 years old eyes can't see small stuff anymore. Thank for the videos.
It’s not boring and I love watching golf.
Only managed to get 30mins in and got to get some sleep, but you've surpassed yourself on this one man. This coil rewinding microsurgery even beats some of your yoke and flyback surgery grafts i recall. Twoobly snoybler.
As I always say, YOU ROCK! Not Boring. No Way will I ever get to see anything like this. I loved this video and learned a lot. Wow how many can say they've rewound an IF Transformer.
Kukudeluxe, your commentary is just awesome ! What an absolute pain to rewind one of those coils. Great repair challenge.
shango, id much rather watch this than golf. this instersts me
I enjoy your videos emmencely. I love old crts. Just getting into the hobby.
I know nothing about fixing TVs but these videos twerkulate me 100% to watch them all.
its very theraputic for us to watch you bring these old sets back to life , prob worth checking and recapping whats needed anyway
The carpet zoomed in would make a great backdrop for your computer. 😊
I love those full cap replacement video, they literally fix everything even a bad CRT.
Just gotta replace the capacitors in the CRT and its brightener too, then it works like new again, guaranteed!
choppy smooshed head, is an art piece, Mr. S.-
They say that a high level of technology is indistinguishable from magic, the repair of the transformer looks like magic or as you stated love! Very interesting repair! Watching you save these lost souls is indeed inspirational! Much better than golf and if I dare watch any news, your videos are contrastingly therapeutic. Please keep sharing!
Well done mister. persistence pays off, very well done actually!
So cool to watch the alignment. Great video Shango, quality is going up and up.
I like the way you think. Cool to watch all of this,
especially since it was made the year I was born.
Interesting to see you rewind that can and it
worked! Glad you had the patience to get it working
good enough in my opinion. Thanks for sharing your
time and trouble to do these videos!
Cheers! 🍻 from N.C., USA
-Big Al
Been waiting for this one. I can hear the agony in your voice. Very frustrating indeed. I don't believe I've ever seen one beat you yet and I'm sure you just need a break from it. Whatever the outcome.. this has been a great series of videos with a ton of whimsical anecdotes and at times savage humor. Thanks for your contributions of knowledge and humor throughout this project. =)
"It's better to buy a virgin and ruin it yourself." Words to live by...
Really like old CRT console tv’s like Penncrest, Magnavox, and Zenith, even if they’re particleboard. It’s a real plus if it has an AM/FM radio 📻 and a record player. Yes, 1970’s, but it’s what I knew. Just the sound of a console, such as in an empty 🏡 house. It’s more than just deep bass. I’ve seen your videos on it. The bright color CRT, the glow of the radio 📻 dial at night, and the ghosting of two radio 📻 stations on top of each other. Radiotvphononut has a similar video of the dial light 💡 on his Astro-Sonic console in his basement with the lights off. I ❤️ love these consoles. The glass radio dial, dial cord complexity. I have an Astro-Sonic console my mom bought me back in 2010 for my birthday 🎂 for $147.00 at Salvation Army. Western Auto, a common product marketed by them. Seen them at the Western Auto in Glennallen Alaska in 1978. Yes, about $380.00, but they were like your first luxury car 🚗 for your living room. That’s my opinion.
Stool consistency, what a great subject!
Pairs well with RT and fried mozzarella stick sandwiches.
"You could be carrying around as much as 10lbs of toxic waste" -- especially if you frequent McDonald's.
@@James_Bowie McDonald's isn't food. It's something else.
- I have three stools in my kitchen; they appear consistent to me!
Nice work Shango! The active power filter is sometimes called a capacitance multiplier. The idea is identical to a voltage regulator where a small capacitor filter circuit is used to regulate a higher current output by using the current amplification of the a pass transistor to do the work. BTW, there are a whole bunch of films in the public domain which may be of more interest than informericals. A list of which can be found on Wikipedia, and copies of some of the films can be found on the internet archive.
I say you did a helluva job for what it was. I can understand being frustrated at trying to get something to work the way it should. Quite an epic series!
thanks for taking the time and making the effort to make and upload this. both for the repair and the adverts it gives a window on a country I hear so much about but no so little of.
I am kind of forced to display the worst of the worst content on the subject television due to copyright flagging. Please Don't Judge my country on the consistency of our stool
@@shango066 i don't know enough to judge but perhaps stool consistency is as good a measure of any or at least how concerned the advertisers think the population should be about it.
Very interesting Shango ! Love watching you diagnose these old sets. Peace.
I like watching both TV IF alignments, AND golf! Color me weird... 😝 IF alignment, or any bandwidth pass or limit filter alignment is tough under the best of circumstances, and having to do this transformer repair and then realign --- FANTASTIC JOB!! ♥️ I was getting the heebie jeebies just watching you work with those microscopic wires!
I've really been enjoying these videos, someone going the extra thousand miles to get a really ancient TV to work😁.
I like how you push that dip completely out of the waveform on the scope...and whalla...! The band pass shows up. That’s some slick moves. Meanwhile, I’d be messing with the traps to get rid of that dip on 45 MHz. You are gooooood !
Shango you are a legend, really interesting stuff... I love your commentary over the toilet burgerage infomercial broadcastalations. Oh I know this is an old video but regarding the regarding the 60Hz display noise bar-age, I would have replaced the whole circuit with a modern voltage regulator and a couple of caps. Germanium power transistor circuits are well I think are a bit of a dark art. keep up the good work.
8 minutes in, and I WAS enjoying my chicken burger.... Thank you Dr. Ho-bags...
Memories of my childhood, TV Hell, quit messing with the TV, I'm trying to watch it.
Yes, to make it work is certainly a goal. Another goal is that its like working on a puzzle. It's both satisfying and frustrating, but the mental exercise is stimulating.
Great video as always. I appreciate the dedication and your time. I’d rather watch your channel vs. golf any day! I think bulk recap is the easiest way for a beginner to feel like they are repairing something. It’s a lot like my trade where I see customers try to repair their car by replacing parts based on what the internet experts tell them. Unfortunately both are met with frequent disaster.
You are my favorite UA-cam channel.
We used to have one in the kitchen way back . It was new when my parents purchased it. It lasted for a long time.
The power filter circuit is actually a capacitor oobely doobler.
You have to tweak it until it's no more squiggly tingly
I'm old enough to remember they still used Twirkumbobblers. :-)
When you are a nerd squigerly lines on a scope are fun to watch.
When I was a kid we had that same TV in our kitchen.
Sorry for the unfortunate outcome shango.
No I'm not gonna comment on the green jacket lol
Great videos as always, your one of a few people I love to watch/listen too repairing old crts.
P.s bust out the Sony
Shango, you're one of the channels that I keep watching regularly this Summer. Your voice sounds a lot like a friend I had in the 90s, a Mr. Dan(a) Hubble, of Winnipeg, Canada. He too was into electronics repair. He was considered the BEST CBer in all of Winnipeg. The Department of Communications would drop by now and then to check that he was running "legal power" on the CB. He used to go to Princess Auto to get electronics parts and also another place I can't remember. He told me all about Pentium CPUs. He was an avid listener of Coast to Coast (Art Bell). Was into WinAmp. When I met him in 1995 he got a copy of Adobe Photoshop. I told him that I couldn't afford Photoshop but that a new programme for Linux (GIMP) did the same thing but for FREE. I miss Dan.
Very awesome you are👍😀The lession recapping doesn't always solve common problems you did right testing all Components.
Nevermind how are you worried about your life by providing a labor Brandy Melville apple butter phone
Unless the caps are bad, there is no point replacing them.
Some would say whats the point restoring vintage computers.
The point is both of us are restoring & preserving our technological histroy that would be lost if we did not.
Have you made arrangements for this technology to be inherited by someone who cares? I don't believe my offspring would care for such old stuff...
@@reinhardvomdobel1325 that is on the to do list
Shango066 - the Joel Robinson of tv repair “Oh yeah, just cook your houseplants for dinner...”
Shango wango z Tango another great video my friend sometimes things can be impossible good luck with it until your next session have a good night
Phew couldent wait for this vid, thanks for sharing
I was getting clammy crawly skin!
Delco made some of the best power transistors in the 60s and early 70s. I still have some Westinghouse germanium power transistors in that package and a home made 1957 power supply that uses them.
You should be able to replace the IF transformer with any LC combination that is tuned to the correct frequency, ie most of them. It is a matter of finding one that can be fitted without dangling in the wind...
@ab5ni Yes that was a dumb statement. You know I knew it was wrong as I wrote it. Still shouldn't be impossible to find a close match...was probably my intent.
@ab5ni I like getting told off. ))
Great vididio! I always thought that the A.P.F. effect was amplifying the filter cap. I ain't touched nothing like that in over 30 years. Shango you are the master.
I'm betting on a part 4. It's not like Shango to give up when he's this close.
this is a GOOD repair, Sir!~
I get such a weird joy out watching this electronic necromancer.
That arrangement is called a "capacitance multiplier" they're using a sziklai pair (like darlington but with a NPN and PNP) as the pass transistor. Basically it filters the input voltage through the 560-5600 divider and C1 and uses that as the "reference" voltage instead of a zener. Pretty smart and effective where regulation isn't required but filtering is.
The output voltage should be less than the input if it's working, did you check the voltages? Might also be a loose connection on C1 or a bodge wire shorting something it shouldn't.
You sir must be a genius technician that actually studied the textbooks in college/uni
@@atomicpunk Lol, not really, just lots of time reading theory about class-AB amps on the internet, mostly sound.whsites.net . EEVblog did a video on the cap. multiplier: ua-cam.com/video/wopmEyZKnYo/v-deo.html
Yeah it's all working. The voltages are correct the Ripple looks correct. The lack of Regulation and the fluctuation in the picture from the audio amp load variations is the most annoying thing. maybe this is just the way it operates. I don't see any real effective form of Regulation
@@shango066 the corner frequency of 560ohms and 1000uf is 0.28Hz. Anything above that should be pretty much gone (like 60hz), below that it passes it straight through (like DC, that's why there's no regulation, this isn't a regulator).
I'd take a look at the input and output rails with a scope. Possibly the input has too much ripple or the transistors don't have enough gain to supply the output so when the load draws a current spike it drops out. Since you replaced X25 possibly X24 has a low hFe, I'd try replacing it just to eliminate it. Be careful with the orientation, this is a PNP so E goes towards the input and C towards output.
Jernej beat me to it! I would put a scope on the base of the NPN and the output of the capacitance multiplier. The hint about a poor connection to C1 seems like a good one. This is not a true regulator circuit; it is just meant to smooth out short-term voltage fluctuations.
Been doing electronic work for a loooog time, screwdriver mechanics were a very common problem. Liked to have choked 'em.
we have Tandy with his TRS-80 that I designed and programmed, and marketed himself, Tandy, the master of Radio shack~
Another great video! Love you analogy towards the end, rather buy a "virgin" and mess it up yourself.
Reminds me of the yeas working on commercial two way gear, someone would always try and bring me a CB that quit working. I always sent them on their way, gads knows what one would find in there. It was bad enough working on one individuals radios, full of roaches and roach egg sacks. Would let them sit for a week in a fumigation box. Another nightmare was repairing pagers or beepers as some would call them. You could always smell the ones that wound up in the urinals. Refused to repair them, a major health hazard, its real easy to scratch oneself on those sharp wires on the back side.
nice, ya know at 12:18 ( showing PCBA solder side ) just to the right of that L9 IF Xformer, i would touch up that solder joint connection that's going to pin 1 (or 4) of L9 . . . Cheers
I had the exact tv and yes it started to roll. Had it in the early 70’s as my first tv. I was In my early teens
thanks for the video.I'm one of your gretest fan.
Oh boy, Realy ? that much ? love those transistors
Nice Unboxing too !
Well i did not know that IF had an effect on stool consistency:¬)
Thumbs up for perceverence.
Even this TV has a Local / DX switch. This seemed to be as important of a feature on most radios of the era as having "DELUXE" emblazoned on the faceplate!!
That transistor box is so well done, looks like something the Japanese would do.
I'd be tempted to replace C37 with a higher value electrolytic like 470uF to see what happens. In 1966, capacitors of 470uF were much larger and much more expensive than they are today, so I wouldn't be surprised if it cured the problem. The engineer who designed this area of the TV probably wanted to put in a larger electrolytic in, but his boss said we're over budget if you put that in, the performance is "good enough".
You're doing a great job on that Toshiba! You can go to parts Express for the speaker
I see quite a few ebay.com RF cans for sale in 10mm and 7mm. Search on IF Tuned Transformer. BTW, I enjoy the videos and the dry humor!
Use your variable DC supply and sub that voltage in, maybe the problem isn't in the power supply? Good Video, you worked on it longer than I probably would have lol
I have a couple of those Delco transistors in the box. Found them at a hamfest 5 years ago.
man kudos for your resolve.
Always adore your sense of humour in your videos, I laughed my head off when you said “booty hole” LOL 😂 xxoo
Listening to shango through a tube amp for audiofool excellence
Thanks for the great video´s ! Why do CRT tv´s hum when text or subtitles are shown? And Computer CRT monitors do not ... Greetings from Belgium
Your persistence is most impressive. You know when you have to take a break from it before you become a danger to it! Can a video tuner EVER get all of the vertical lines on the resolution test pattern to show on the best monitor? Although my expertise is more on the mechanical (VTR) side of things, I know others would have condemned that tuner as a basket case. In a VTR I owned I tried to loosen a partially pre-destroyed inductor/choke slug and felt one wire pop, realized what happened and then gave it some real torque.
Talking about patients what about cataracts I’ve had it take so long to get off so much careful attention to it and then the lens pop off and fall on the ground and shatter. A lot of the soldering work aside from capacitor changes are crazy small or delicate especially on solid state stuff. So many times I’ve wanted to throw stuff out the window which another thing I absolutely hate to work on is phonograph cartridges with the pins breaking easily or putting new wires on if you have ever had to do an rca rp190 cart replacement.
I have one of those testers and the clamp block on mine has gone bad. It no longer recognizes any thing I plug into it. It had solder pads I was able to attach wires with clips to and that works well. I don't know how good those clamp blocks are generally but mine was junk.
My grandfather work for DELCO for 41years and development most of those transistor that you got there.
Wonder if kicking down the signal out of the DirecTV or converter box with an inline 75 ohm attenuator would solve the overmodulation/ not enough gain issue with the local and DX switch.
I have found signals from converters sometimes work better when passed thru a VCR and then to the TV. I may work on something more portable sometime. You may try a VCR etc in line sometime.
"..you know me all too well, mr. TV."
Do you know you can put the m-tester in calibration mode if you hold the button down for 10 seconds?
Those Japanese Toko branded transformers were actually commonly found in later 1970s and 1980s electronics. You can still purchase NOS ones right on eBay if you ever decide to change them out.
Hahahahaha, from stool consistency to TV- alignment, you're a funny guy LOL
The “active filtering” is a type of Darlington pair. If you deactivate that ckt, and find how that rail is being energized, you’ll find the ripple issue …
At 1:02:00 is that the regulation for the 12 volt section ? This TV can run on a 12 Volt source. That being said...it would do nothing for the 60Hz noise from mains power. If I’m wrong, I’ll admit it. Just a thought I had....
Cores out of a 455khz if won't work at all in a 45mhz IF coil, but cores out of a 10.7mhz IF might.
I commented in your last video that you could build a replacement coil by winding one on a small toroid core, either a T30-10 or a T37-10 should work, with about 15 turns tapped at 5 turns for the ground. Tune it with a small (30pf) trimmer cap. Toroids can be obtained from kitsandparts.com.
I totally agree with you, maybe 10 windings (5mm diameter, winding on winding) will fit für the resonant circuit (depends of the C of course, that is about 20pF here, see shematic..) and 3 für the neutralisation-feedback... In the original filtercoil there were only one for the neutral. feedback and 3...5 for the resonant circuit, as far as I rem. ... It can be experimentally determined, perhaps with "flying" air-core-coils and trimmer. If only this coil is not shielded, ist will probably not make problems with unwanted oscillating of the if-amp.
@ab5ni It's just another tank(parallel LC) circuit. if you go by this formula of f = 1/(2*pi*sqrt(L*C)). You should be about to mix and mach both a coil and cap to get what you need.
I get such a kick out of how you comment on the commercials ! In this one...the way you do the whole..”duuuur dee duurrrrr” on the guy selling the fryer. I’ve seen that commercial. He’s a bleach blonde surfer dude from L.A. ( No offense Shango, I know you too are from L.A.)
I just couldn’t help but bust a gut when you did that !
@ 53:39 - Stacey Herbert shore haz a purdy mouf! I be luv me some Max & Stacey! @ 1:02:35 - How much ripple have you got at point 105 - top of C1 1000 mike. I once drove out to my dad's house to change main filter cap in a Sony - turned out it wasn't main filter, had to make second trip to replace small electrolytic on base of regulator driver transistor. I also had a small 5" Sony B&W AC/12 volt power - didn't have the ripple, but horiz width fluctuated with audio power. Like you I replaced the Selenium bridge with silicon - no luck. This set didn't have a regulator circuit. I installed a 7812 regulator - fixed it right up. No sweep width variation with full blast audio.
That circuit is a capacitance multiplier to filter ripple out . Old Germaniums go back quite often. These can be replaced with silicon. The filter caps maybe bad too. Too bad you dont use a scope . would have made it very easy to check ripple
You can fix that IF transformer. I wind my own inductors, just save the core (hopefully its not frozen), bend up the 4 tabs on the bottom, the magnet wire was open I just soldered it but you can rewind it especially if you have an lcr meter
The power regulator is a Szicklai pair and is operating as an emitter follower, the big transistor looks to the circuit like the little driver. I was surprised to see this as it was only invented in about 1960. EDIT a resistor and 12V zener divider between base and collector of the Zicklai (Emitter of big one and bass of little one) would make it a proper regulator.
A long shot, but I have had odd hum bar issues traced back to bad grounds from PCB to chassis.
Can the not use crystal filters to replace the if cans, what about a 2N2955 for the PNP and a 2N3055 for the NPN and have done with it.
Hi..basic ripple check on the supply voltages with the scope or just the dmm on ac mode??
was it Sears, or just Craftsman tools, if it is broken, bring it back for another, just like zippo lighters~ (did work on the zippo manufacturing machinery in 1986~ bradford, PA
is the crt grounding ok?
I believe you connected the windings of the coil wrong, but I could not see it clearly.
From the circuit board layout it seems the ground is at the corner pin of the coil and not the middle pin.
I believe I saw you connect the tap point to the center pin, which would be wrong.
Larry King was still old when this TV was new.
Shoutout to Dr. Ho
Pop a Seresto? Did you get fleas from that dirty TV?
Im sorry but im glad my shiny new transistor just comes in a plastic bag.. probably at 10 for a dollar too.. that germanium transistor in a box wouldn't have been cheap in its day brand new