SPOT MY MISTAKES! - 1973 Fender Deluxe Reverb Silverface Tube Guitar Amp Repair Service Bias
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- Опубліковано 29 вер 2024
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In this video we do a full service and repair on a vintage 1973 Fender Deluxe Reverb tube guitar amp. We'll change all the electrolytic caps, clean everything, and try to figure out why it's making noise.
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Never pull live tubes !!!,-Ever !!!
Do it all the time with preamp tubes. It hurts nothing.
I was a TV repairman in the 60's and 70' L(which meant we worked on everything electronic) and pulled live tubes all the time. The only tube you didn't touch while operating was the horizontal output tube. (high voltage)
Brad heres a new restoration video. A boombox like the Kenwood tape deck restoration. 🤣🤣🤣 ua-cam.com/video/aVI8JqzdtOs/v-deo.html
Like Brad said, they probably start with duplicates, 1 working unit, and one that sat in the ocean for a month. Make a video of a "repair" and splice the good working unit tape at the end. Voila !
Don Rutter lol i doubt that some bored asian farmer would fake a video lol. For what? Views? Lol
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Great to see amp stuff again
Thanks for watching, as always!
@@TheGuitologist SPF is better !!😜😜
Fantastic - actual amp repairs, the reason that drew me to this fantastic channel
yes indeedy.
I thought I was the only one. Obviously not. An Uncle Doug repair and a Guitologist repair - all within 24 hours. It must be Christmas.
@@SimonGotlieb two of the best
Pedro147 spot the error yet?
@@TheGuitologist in the repair or my reply Brad :) PS - oh I see now that I read all the comments. I'll get back to you
Good Brad, I like to install over rated Electrolytic caps, they will last longer, good job. I know it is easy miss stuff on the board, good find and no problems. I really like your playing after you do a repair and I like those the best times on your channel. I love tube amps, I work them when I can...Take care old amp tech.
480vdc on the plates with 450 volt caps. It’s scary. I’d atleast use a 500 volt cap at C1 and C2 for a little safety margin.
Yes! Uncle Doug Yesterday, you with a repair vid today! What a great fucking week! God Bless America! Thank you Brad!!
Come on man... I had several videos this week.... all the tech crew is hard at work.
DeadKoby Sorry .... who are you? To each their own I guess ... but I Jest, I’m sure I’ll click on one of your vids at some point.
I've never seen inside such an iconic amp like this before. This content was educational, entertaining and relaxing. Thanks!
Cool. Glad you enjoyed it. Check my playlists on my channel page if you like this type of thing.
Sounds good. Fender suggests to set the bias by the magnitude of the negative grid voltage: I believe it is specified as -35VDC on that model. I was hoping you would measure that for the camera. However, I understand your method such as it is. In theory, a -35VDC grid voltage would put the other specs in the proper ballpark. Some techs I know like to observe the sine wave on a scope and dial until the trace is smooth and fluid. I never found your error, though. I enjoyed the video as I usually do.
Also, I think 410VDC is the standard plate voltage for 6V6 on that model. Maybe the excess was from the solid state rectifier mod. In which case, your bias method would be safer than following the standard bias practice. I would have guessed a fifty-volt difference, not an seventy-volt difference.
Thanks for the thoughtful comment. All bets are off on using printed schematic voltages to bias an amp. The wall voltages have changed since then, components drifted, not all PTs offer the exact same voltages. Given the tolerances of components, doing the actual plate dissipation calculations or, as you pointed out, adjusting for sine wave crossover distortion, is the proper way to go. I'd never just use the printed bias voltage on the schematics. They're almost always wrong for what's ideal.
You -never- set a bias voltage by voltage alone. The purpose of the bias is to set the idle current in the output tubes. If you are not setting it by monitoring the output tube current you are doing it wrong. Period.
@@550zdatsun You can skip the Tablets of Moses routine. I know what the negative voltage on the grids is for, and that is exactly what Fender meant when they wrote them on the schematics for the model. It is exactly the method called for by most of the major tube amp manufacturers, Marantz, Eico, Dynaco, and also other guitar amp manufacturers. I have no quarrel with measuring the current, but you can cut the pseudo-religious crap. Most tube amps offer an adjustment for the grid voltage, and they specify a negative grid voltage for the grids in a fixed biased amp. There is no doubt what they intended. Some include a balance, but most do not.
Love that pickguard ever so much.
Glad your using it in your vids!
i can see a 5y3 sagging with a pair of 6v6s but a 5u4 shouldnt sag much.
It would be less sag than the 5Y3, yes.
Love. That. Intro. 🔥
Why can’t I solder!! Every time I try the shit just balls up and falls to the floor. Can’t get it to stick to the iron or the wires I’m soldering. Thrown away two irons and im just over it. Any tips?
Use solder with a mix of lead and tin and with a rosin core as a built-in flux agent. You don't heat the solder. You heat the WORK. For instance, if you're soldering to a pot, heat up the pot TERMINAL by putting your iron on that. Your wire should already be hooked around the terminal. Then when the work is hot, ADD solder. Solder will tend to run TOWARD the heat, so if the work is hot, the solder will pool there.
The Guitologist I did that and use rosin core solder. Still rolls off or doesn’t stick at all. Ive tried heating the work and the solder didn’t do anything. I’ve done all the tips and techniques I’ve seen or heard. Still not having any luck. Maybe it’s something I just can’t do?
@@Cjwilly333 : Sounds like the best solution is going to be to find someone who knows roughly what they're doing, and get an in-person lesson (both with their equipment and with yours). What you're describing sounds like something subtle is wrong somewhere in the setup, but it's not at all obvious what it is without using it.
Brooks Moses thanks I appreciate your input. I’ve had a couple friends show me hands on before. And I thought I got it honestly. And I wired up some Texas specials in my strat by the skin of my teeth. I’m just waiting on the wires to come loose. But that was a few weeks back and I haven’t had any more luck gettin any solder to stick. But I’m sure your right I need more hands on teaching. That’s the only way I learn anyway.
Always love the vids, but ears heard the beginning of Benny Hill, two great things!
Brad are you ok?
Isn't it unusual to have both a death cap and a factory 3-wire power cord in the same unit? Certainly no need for a death cap !!
It was probably Phillip McKnugget that disliked this video
WD 40 contact cliner
Dude, you're way over your head. Send it to Restoration and Metal, he knows what he's doing.
:) :) :)
Best comment
Needs more ramen.
pfff lol!!!!!
Quit noodling around!
Should have used a pressure washer and a wire wheel under the doghouse. Spray painted those original caps and put them back in. Haven't you learned anything?
He taught us way more than he ever learned, that's for sure!
🤣🤣🤣 ua-cam.com/video/aVI8JqzdtOs/v-deo.html
lol
This is very dissapointing, I expect you are walking through the swamp and luckily found those legit vintage Fender amp under the mud!
Naaa, Brad finds them in the Ohio River.
Someone threw a locomotive into the mud in New Zealand
ua-cam.com/video/R8pLzhjJY1s/v-deo.html&spfreload=5
Hey Brad, thanks for these videos really learn a lot👍🏻👍🏻✌🏻
That Thames Television (London weekend television) intro takes me back lol.
I got a hankering for some Benny Hill after seeing that!!
@@eugenemcleer8407 haha, or the Goodies ;)
Love your videos dude and I’m probably gonna catch a lot of grief from the Deluxe Reverb fan club but I have to respectfully disagree.
Although the Deluxe Reverb can be a great sounding amp in a stand alone situation with the volume and reverb set correctly, that all drastically changes in a “live band” situation with real drums.
I’m not talking FOH (can mic the amp to FOH and they do what they do) I’m talking stage sound. What I’m hearing and have to live with.
My Deluxe would quickly become completely swamped on stage by the drums.
If I turned up the amp I would lose the “beautiful “sweet spot” and the bass end would become very “flubby”.
I could compensate somewhat by having the amp routed (by sound crew) to my on stage monitor but that kind of defeated the purpose of having the amp onstage as now my stage tone and volume is at the mercy of the sound crew.
I switched over to a slightly more powerful ( extremely heavy) Black Face Super Reverb and what a difference.
Much larger “sweet spot” tight bass at any volume.
Can hold its own onstage with any drummer. (Cons: Super Heavy to lug around compared to the Deluxe).
I guess my point is that these vintage amps are becoming extremely pricey (Even silver face Fenders now) most players can only afford one amp and to try and make that one amp fit all live gig and recording gig circumstances is difficult.
Before you buy make sure the amp is going to fit your need.
I had convinced myself through videos and comments that the Deluxe was going to be my “dream amp” Even playing it stand alone ... beautiful!
I love the Deluxe Reverb in the studio and for very small
gigs with no drummer, but for a live band situation I found the Black Face Super Reverb to be the perfect amp.(for now 😁)
This is just my opinion and your mileage may vary.
Keep the Great Videos coming !
Fair enough. A Twin Reverb kills in a live situation with a drummer too. Stays cleaner though.
@@TheGuitologist Really depends on how you're playing it, I reckon. I'm playing in a band with two other guitarists, one with a Marshall DSL20, the other with a DSL40C. I'm using a homebuilt amp, using a 5F1 circuit in a 5E3 Deluxe cabinet, modded with switchable NFB and switchable cathode resistors & bypass caps on V1A and V1B, which is dissipating at max 11 watts, probably 7 of which is heat, and those guys are forever asking me to turn down. We're playing some pretty loud rock, and I have no problems being heard. Obviously, headroom isn't the greatest, but hell, I ain't soloing and my Strat and my 5420 Gretsch cut through just fine.
Simon Gotlieb : I think your correct there ... I use a clean platform and get my dirt from either a OD pedal or a boost to push the amp.
I should have been more clear about that. 🤙
Lol my grandfather used to say "the only people who dont make mistakes are people who dont do anything"
SO RIGHT! But if you take to the next level, "Not doing anything" can be a BIG mistake!
Try not to post these amp repair videos around lunchtime will ya? You made me miss Gunsmoke.
INSP channel at 7pm, 10pm-12am. Gunsmoke re-runs.
You probably heard that wire arc then smelled ozone from it. That would be my guess. But just a guess.
Haven't read the comments late to the party. Saw the ground wire of course but noticed the rating on the caps 450 vs 481 plate current probably due to that rectifier. Regardless great way to end the week watching you with a deluxe and uncle Doug switching caps on an 86 Marshall. Keep it up Brad you and Doug are my must watch tv.
481 plate volts and 450 volt rated caps HMMM!
I've made this mistake before and it took another tech to point it out. Easy to do.
Man I've had the day and I'm finally home thinking 'What I need is a new Brad amp repair video'. Made my night.
Thanks for watching, man.
Putting the 22mf at 450v in the doghouse. The plate voltage was 485v! I wonder if the initial voltage is over 500 before the tubes get loading. GZ34 will fix all that. If you want the low loss of solid state put in a mercury vapor rectifier, they glow blue and act the same as solid state. A big mistake is not using a scope. Your ears can’t see what’s going on with a signal. Your only guessing by trial and error most the time! LOL
He who smelt it ...... Well... you know. :)
Dang it, I love your vids. And I know you respect Uncle Doug as well, who had a good one in the past day or so on converting a Marshall 1986 Bass to a 1987 Lead schematic. But I believe even Uncle Doug will admit you are a better guitar player. But I WISH that I had this Uncle Doug fellow as a science teacher back when I was in high school! (Timeline wise, that is not impossible, but it didn't happen.) Alas, you are too young to have even been my kids high school teachers, but I won't hold my superior years against you! Rock on, brother!
Ken Davis I had a couple teachers who were like Uncle Doug. People like him made school tolerable.
Sorry if I missed it somewhere, but is there any concern with using 450V rated caps when you're measuring is 481V at the plates of the 6V6's?
Exactly. Especially because the actual highest B+ voltage is even a couple of volts higher than the voltage measured on tube plates because the resistance of the OT primary lowers the plate voltage a bit. And if the rectifier was original tube, not that solid state, those caps would probably have much easier life.
@@jutukka Yeah good point. So B+ potentially in the 490 region.. They are more expensive, but 500V caps are available. I assume the increased B+ is due to using diodes instead of the tube rectifier. An alternative to getting higher rated caps is to use a 50V or so zener diode and connecting it from the CT of the HT winding to ground. Searching "zener diode trick to lower B+" on google will find a number of guides. I did this once in a 2204 JCM800 Marshall to bring B+ down a bit, worked like a charm.
@@joelpeech8964 And what makes things even more difficult for those caps, especially the first one after the rectifier, is that the inner resistance of the original tube rectifier is gone and if there is no added series resistor after the SS rectifier, it means that the peak surge currents of that first cap are very high. No wonder at all that the one particular cap had spread it fluids into the dog house.😁
I scrolled through the comments to see if I´m the only one who noticed that. I´m also wondering why Brad didn´t noticed that. Maybe he will read this and do something about it, otherwise those caps, especially the first one wont have a long life in my opinion.
How did I miss your comment. Yeah, and actually I've already gone back and replaced those with 500V caps and I had a contest going in the pinned comment seeing who would spot this first, but you already had. You win a prize! Not sure what yet. But email me and I'll figure out something to send you: bradlinzy at gmail
The original schematic calls for 450V. The amp had 475V upon review of the video, but the actual voltage, as we saw, was about 480V because of the SS rectifier. So yes, 500V was the appropriate value to use and I missed it.
Awesome video Brad , the way you explain these things so us laymen can sort of understand is amazing! by far a daily ritual for me is visiting this fantastic channel ! Cant Wait for #SHITPOSTFRIDAY ! Regards from snowy cold frozen Canada
Raising Arizona 👍🏽 nick cage did make “a”good movie after Valley girl 😂
"Son, you got a panty on your head!"
wild at heart was ok
I liked 'The Rock' and 'Con Air'. Pure popcorn movies!
There is an error in this video. First one to comment what that error is wins a prize!!! To be fair, there are two right answers. I'd accept either as correct.
The Guitologist was it when you plugged the card in the top right the second time and it never appeared?
Maybe when you said you needed to order 22uf caps, then proceeded to install some in the dog house? It was 25uf caps you needed I believe)
Maybe when you were about to bias the output tubes and said it twice?
I assume it’s not the ground connection ;)
@@LitesLAB The same card won't appear twice. No, this has to do with the amp itself.
Brad , i think when talking about the cathode bias electrolytics , you say theres not a lot of current flowing . I think you meant to say there's not a lot of voltage across those caps . Do i win 😁
I didn't see a wire brush either
you didn't leave it in the muck for 4 months before fixing it.
Cold solder joint under the dog house. Nice catch. You could have been looking for that for a long time and not found it. I think you would have smelled that dead raccoon smell if you blew one of those power caps. I almost blew my face off a few months ago wiring a power cap backwards into an old Standel PA. You are inspiring me to rip my Fender PA 135 apart this weekend and find the problem.
I GOT IT! The error is that you grew up in Kentucky and they didn't run you outta the state for not being a RABID U of K basketball fanatic. What'd I win?
One of the issues with a solid state rectifier you didn't mention is that the high voltage comes up immediately before any of the tubes start drawing. That can over voltage the power supply caps - especially the ones toward the preamp section as there's no current flowing in the dropping resistors yet. Sure, some amps are designed for solid state, but sticking in a SS substitute in a amp intended for a tube rectifier can set you up for problems if you don't check to see if it over voltages the caps on start up.
I would have ditched the solid state rectifier and put in the 5u4(?) first. Tube amps really benefit from some soft compression from tube rectification. Otherwise, that amp will lose its silk and sound somewhat harsh.
Cut out the death cap and check the power cord to make sure that the hot is going thru the switch and the fuse.
Test all tubes for shorts, microphonics, and leakage.
Inspect all grounds.
Clean ALL pots and the input jacks too.
Check all resistors for tolerance.
Replace bypass caps to the 6L6's.
Replace all electrolytic caps.
Set the bias.
Check board for microphonic caps and resistors.
Turn it up to 9, then play some Hendrix.
Capacitor exploded because working voltage was exceeded using the solid state rectifier.
How come I can't comment, on your News page ( Not a video ) Do I have to join a club to be able to do that?.I wanna'd chime in, on a important issue ... Can ta tell me what am doing worng, So I don;t have this problem again. Thanks, " The Only Channel That Matters... "
Shoulda started the video when it was running OK then fucked it up--play video backwards WiN……..;-) I smelled IT!..
The first Mallory you pointed at looked like a 5u 50v. That amp sounds incredible after you are done with it. Reverb is nice and lush. Great playing too as always. You're a heavy duty player man. You're very humble too about it.
By reading through the comments, your main mistake was asking people to "spot my mistakes." I once posed that same line of thought to my wife. Um,,,, ex wife. I must admit, it turned out much worse..
First thing I noticed: Not lifting the eyelet board for the capacitors risks shorting B+ to chassis... That's something that bothers me. But, clearly that wasn't the issue. I'd guess the wire contacted and it arced.
You're measuring 481 Volts plate voltage and you're replacing 450 Volt capacitors !!!! big mistake LOL
Glad to see another amp project!
Tube Amp Tech Ditty
"Got one hand in my pocket the other on the probe. Cranking the variac waiting for the glow.
Seeking validation for my troubleshooting plan. If I can fix this baby I will be a happy man.
The filaments are glowing as the heater current flows. Watching AC current while my dim bulb barely glows.
Checking for high voltage, no flashes we are hot. Max the bias voltage with a twist of the right pot.
Looking good so far, good luck we have had some. But lets apply the volume we've got signal but no hum.
Victory attained, fidelity restored, it's time to start another so that we don't get bored."
Keep em glowing! Cheers!
Real men admit their mistakes, awesome vid.
⭐⭐⭐⭐⭐
The goal of Fender was to get their amps to play cleaner at higher volumes. But as soon as they achieve that the world wanted distortion. Oops. Mesa Boogie stepped in. And Fender has been playing catch-up ever since.
Mesa is a four-letter word here...don't mention them...
I think fenders first attempt to compete with Boogie was the fender 75. Which was a big fail.
Brad Classic Fender reverb and your Tele speaks well through it Great Job 🤘🏻🤘🏻😎
Only halfway thru and no wirebrush so far? And theres me thinking ur a professional!
Did not find the error. What were the differences from the '65 BF Deluxe and this '73? It sounds like. '65. I know it is said after CBS bought Fender, their engineers changed certain components to either make the amp more reliable or something. Is it worth changing it back to a '65 circuit? Glad and grateful for this great service video! There is NO such thing as too many amp service videos! The reason is they are all different! Your step by step troubleshooting tutorial is like being a class room being taught by a professor of tube amps! Hey that makes you the Professor of Tube Amps! Congrats! Thanxz
I go over the differences in a previous video linked in a card in the upper right corner of the screen. Hover your mouse to go to that video. Changes were minimal. Almost non-existent.
Ive seen those Mallory 25uf/25v caps go up to 100uf. That was one hell of a gained up Super Reverb.
I can’t stand that old Fender PVC lead wire! That stuff has broken on me, inside of the insulation, driving me in-fuckin-sane hunting down problems.
Tube Depot has plans for a great bias probe too. They used to sell kits, but I guess it stopped being profitable or too high risk.
I actually refined the design away from using a tube base. Costs a couple dollars more, but it's still only like $6 for a bias probe.
This is definitely one of my favorite channels. I really miss the smell of melting solder, burnt Bakelite and anything surplus. All the best from beautiful Portugal.
Never understood why Silverfaces got such a bad wrap. Owned quite a few and they always sounded great. My fave was a particular Bandmaster 50W head. Wish I still had it.
Opacification. You know I love you man but you were killing me me mispronouncing that word. LOL I love you Brad! What an awesome video. I totally dig your style. I love this channel!
Another Great Video Brad. Love that you are back on the repair bench. And the goof with the value of the filter caps was the first thing that came to mind when you measured the plate voltage of 481. I saw in the comments where you corrected that so no future meltdown for the customer.
I actually realized it watching the video back later on. D-OH!
Too bad your crappy playing can’t emphasize the chimey goodness of this vintage rig ;)
True.
And thus explains why I prefer to do caps One at a time... and Jhook instead of pulling things out of crowded eyelets. This doesn't mean my technique is superior, but it does work FOR ME to reduce goof-ups.
I do that sometimes too. I don't like to j hook on eyelets, but sometimes you have to, yes!
Diode rectification and no tube load I bet you had higher voltage than the caps were rated for
Hey Brad,
That GT solid state rectifier has a 5U4 model number, so GT presumably put components in it to approximate the voltage drop of a 5U4 tube. Just an assumption, of course.
Those GT SS recto modules are great. I use one in my '58 bassman. I wouldn't plug one into just any old amp though, as they can cause older caps to 'strain'...or fail. Cleans up the feel and some of that flubby old fender thing. I love them, in the right amp.
@@TheDogPa Do you know about the Weber Copper Caps?. They are rec tube solid state replacements that are designed to copy the characteristics of the actual tube. Same sag/voltage drop as their tube equivalent but don't require filament voltage, and are more sturdy than a tube. Many people keep one handy as an emergency replacement even if they continue using a real rec tube. Also, some of them are much cheaper than the same tube, especially in the case of the 5AR4 version.
@@electrofrying1685 Solid state rectification simply reacts and sounds better to me...unless I'm playing a harmonica.
Arc flash - the loose ground flashed, audible and created a little ozone. A mini lightning strike!
Good theory.
Love the repair videos, and especially when not everything goes right. I learn the most from those.
testing those caps with that esr meter (i have one of those as well) the only true way to test those filters is under high voltage load. then you will reallly see them fail.
Hiya Brad! Would you ever consider putting in footage of tube testing in the videos? I enjoy testing tubes as much as I enjoy the actual repairs, so at least for me, any footage of tube testing would be a welcome addition! Keep the vids coming!
I've always considered that stuff pretty boring, but I can do that.
@@TheGuitologist It certainly isn't required or anything, I was just curious about it was all. I would get an interest check from your viewers and see if they'd be interested and go with what they say for sure. Thanks for the response!
also i thought those solid state plug in rectifier replacments had a sag resistor to simulate a tube rectifier.
scott nicolich I half expected to see a resistor too, but not this one.
@@TheGuitologist also brother i appreciate you and your channel. Been subscribed since you were doing amp demos sitting on the floor with no shoes. I realized when you had a few rants on spf that you and i are similar in many ways and if you lived in New Orleans or i lived in Louisville we would be buds. Cheers
You should show the proper way to discharge the amp and how to check it to know its safe to work on..
Is that the error, it should be!
And remove rings, jewelery etc..
You're not wrong on any of these counts. I certainly won't argue against safety precautions. But no, that's not the error I was alluding to.
Love you and your channel bud! Serape is Spanish and is pronounced sair-RAH-pay.
@@electrofrying1685 i believe that is what I said except i show the accent too.
Always good info. Brad, do you have anything on Fender FAT series repairs like the HRD's?
Regards,
David
Why didn't you use a wirebrush and a waterhose,would have gone way faster man !
just made a tough day easier 👍
Tones at the end were beautiful.
Thanks dude, your repair vids (like a couple of others I follow) feel like sitting down, having a chat , getting some "learnin" 😉 and fixing something.
All the best mate.
Reminds me of when I had my 1996 Fender pro-sonic calibrated. It nearly killed the service guy.
Back in the seventies we considered those silverface Fenders a real come-down from the blackface amps. Even the silver strip used to come loose. Everything used to crackle when you turned the control knobs. Good to get rid of those crapacitors. I'm sure it can be fixed up to sound pretty good. Put a tube rectifier in it; amps with tube rectifiers cost an arm and a leg these days. Solid-state sucks, eh? Each to his zone.
Thanks Brad! Do as I say and not as I do does not work. Better to check high voltage caps and not assume anything - it only takes a few seconds.
You aren't wrong in that.
Man we had this one in highschool. What an amp. Good memories.... Until in grade 11 I saw these goons carting away all the instruments from the music room.
There's when I found out our music program was over. So glad to graduate that year and get out.
That highschool doesn't exist anymore.
Hey, 481V on caps rated for 450v - you are asking for trouble! So use a real tube rectifier may help reduce that voltage to be in line, or put 500V caps in it. You may get lucky, and you may not. I say this because of course, it has happened to me! Otherwise, no issues.
Yep. Already put the 500v in yesterday after reviewing the video. Started thinking “hang on a minute”...
@@TheGuitologist You don't have to change all of the 450v caps, just the stages right near or over 450. Changing the first one might do it. It should take 450 fine as it is rated there. You should allow a little bit of room though, just because AC can drift and vary in different locations - sometimes quite a bit. That is why you don't want to stick in a SS rectifier, it raises the voltage considerably. You may get away with it, but many times you won't for long. I have seen ones that go on standby and the load is off and the voltage shoots up and blows the cap. You can get SS rectifiers that also simulate the voltage drop but those get really HOT. Best to avoid SS rectifiers if the voltage is anywhere near the cap limit. Tubes may not like the high voltage either, although it varies widely by the particular tube.
@@TheGuitologist you may have mentioned it in another comment Brad, but was this the mistake ?
Yay! I love your repair vids. Love all your vids but the repair vids are kinda almost nostalgic now versus a year or two ago. Love 'em. Thanks!! This one needed more cursing tho!! 8-).
I wish I lived closer I have a great amp for you to try and figure out a 1989/90 Mesa Boogie 50 cal+ many have tried and it's cost me a fortune and still it's messed up , sad but true. love your videos, Peace !
I’m with you on this one, Brad. The Deluxe would be my pick of one Fender amp. Size, weight, tone, features. The perfect Fender.
I had a SF Deluxe and a SF Princeton amp burn to cinders in a barn fire last year. Owned them both for 30+ years and one had a JBL and the other an Altec 417-8H. So you have 481 volts on your 450 volt caps, eh? I would go back to a tube rectifier, you're tempting fate, you're much safer with that voltage drop and slow warmup. If a GZ34 is too expensive (and lots of the Russian ones are bad out of the box) you can find $10 NOS US-made 5V4s (for low voltage drop) or a dumb 5Y3. Both are 2 Amp filament in an amp that can handle a 3 amp 5U4.
I agree that it’s the best amp Fender ever made.
I had a ‘67 Blackface DR and a ‘73 Silverface.
I kept the Silverface because it sounded better and I’ve had it as my amp for decades.
I’ve rebuilt the thing, and it has RCA Blackplate 6L6’s and RCA BLACKPLATE 5751’s as preamp tubes, and a GE-6201 phase inverter.
I liked the sound if the Mallory 150’s better than Orange Drops and went back to all carbon resistors.
I also turned it into a head that is coupled to an Avatar 2x12 loaded with vintage Celestion Greenbacks
Hi Brad.. Very cool Video.. i am in no way ever going to work on my own Amplifiers.. I just don't understand electronics.. Is it just as easy for you to work on Tube Amplifiers with the Green Board over this point to point wiring? I am just wondering because I have a Vox AC30cc2, An Orange TH30 and a Marshall JCM 2000 DSL 100.. I am hoping to get many years out of these Amps. Obviously everything deteriorates over time.. I am just hoping that they are Amplifiers that can be serviced in the future when things go wrong or are they basically throw away junk? By the way, I did not realise just how much of an accomplished player you are.. Your playing was beautiful.. Thanks for the video.. I love watching you work.. Cheers!!!
Did I just see "the golden Tele tuners of mystery" at the end of this wonderful video?! You've got that amp sounding great bro! Keep posting and I'll keep watching. ✌🏻️and God bless
I have a silver face bandmaster that starts out good but once she warms up it just craps out. Your videos are making me want to pop it open and poke around.
What happens when it craps out?
The Guitologist it just looses gain and doesn’t have much volume. I haven’t fired it up in like 8 years. I really need to pull it out of the closet.
OMG NO SPF ...WE ARE ALL GOING TO DIE
What kind of contact cleaner do you recommend to clean the tube sockets? Never mind I see you put that later in the video. I'm watching it now :)
Dude, listen to yourself! Check out what you said at about 13:49 when talking about replacing a tube rectifier with a SS rectifier and about voltages. 😁
"...the voltages going to be higher..."
I mean you said exactly what is true and what I hoped to hear and was happy to hear because I myself have been struggling for years with this eternal problem whether to get rid of those saggy tube rectifiers (or not) and replace them with reliable and lossless SS rectifiers and have to face that higher B+ voltage problem. Just a few weeks ago I decided not to replace a GZ34 with diodes in one my own 60's amp even if I had to use (i.e. sacrifice) a NOS Mullard worth of a three figure sum of money. But life is full of choices.
I never! Ever! Measure plate voltages with both hands! I clip the ground lead to the chassis and then with one hand behind my back I probe the plate voltage. You don’t ever want 450+ volts across one hand to the other.
That being said I have this same amp. The two biggest improvements I’ve made were to clip out the 1200pF caps on the grids of the output tubes and replace the crappy Utah speaker with a Jensen blue frame. I’ve A/B’d it against an all original ‘65 with the original Jensen and with eyes closed no one could tell them apart. FWIW.
I used to swear by Groove Tubes. Till the pair in my Fender Deville blew out during a gig. By the smell I thought they toasted my amp, thankfully no. Got a used pair of TAD 6L6s off the internet. Had them installed and biased. That was 10 years ago. Guess what I go with now??
I used to swear by Groove Tubes. Till the pair in my Fender Deville blew out during a gig. By the smell I thought they toasted my amp, thankfully no. Got a used pair of TAD 6L6s off the internet. Had them installed and biased. That was 10 years ago. Guess what I go with now??
This is exactly why I really enjoy your channel!! Your so honest!! We all make mistakes but unlike you we aren’t making them on video.. I wouldn’t have one issue with you working on any of my amps.. none!! Thanks for sharing this as I always take something away from them... Your Vids are Top Tier!!
There's one more big one I made as well. Can you spot it?
The Guitologist I’m pretty sure it has something to do with the SS Rec. of mine has the Gz34...I’m running late 50’s 6v6 Raytheon’s in it and I warned mine up from the cold 18.5ma up to 22ma and it rocks it with zero issues for 5 years.. gotta love those older power tubes Brad.. I know ... no prize..but an awesome video none the less
Always like it when Brad breaks out the Teleballer Bootycaster
Hi Brad, I just saw an older video of yours about Carvin closing. I can't believe it, but then yes, they probly had a hard time during the shitty Obama 3rd world type of economy in the U.S. for those 8 years, and still trying to keep manufacturing in America. I had a Carvin 60w combo amp that sounded so awesome, I was stupid for selling it one day years later. It was the year they used the gray carpet type material on the outside before they went back to black. Carvin over delivered in quality for the price.
That deluxe reverb sounds great...!! Watch those long cap leads.... don't let them short out. Brad needs a class in Military Spec Soldering.....LOL
i give up - is the answer star wars?
Looked but couldn't see any mistakes? Maybe poking around with your finger under the doghouse on the second pass where you thought a cap had blown? Was the amp still connected? Caps discharged? But then again you know what you're doing......another great video Brad. Keep them coming!
20 years ago I was only using nothing but Groove Tubes and had nothing but problems, they burned out really fast , even with a cooler bias setting. Even causing my amp to catch fire, not kidding. I was playing and about 15 minutes into playing there was a lot of smoke. Turns out the tubes (new ones) got so hot , the tube sockets were mounted directly to the board, and caused the actual circuit board to catch fire. Luckily I have a amazing amp tech that cut out all the burt section and point to point wired my amp and has worked amazing every since. Now the sockets are chassis mounted.
That being said, I never ran GTs again, I just run Mesa Boogie tubes and never had an issue, and much cheaper.
Great video's Brad, always love the content, cheers!
Nice guitar picking at end brad