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FDP Forum / Amp Mods, Repairs, and Projects / Restoring a SF AB763 Deluxe Reverb

yyr123

United States

Just a Guy who likes to play guitar
Jan 17th, 2019 11:12 PM   Edit   Profile  

So my grandad played and this is one of the amps that I actually ended up getting. (I missed out on the guitars and the Bassman amp)

Anyway I would like your guys opinion on where I could go to get quality parts to start bringing this back to life?

I don’t want cheap china parts, quality sockets and caps and resistors excetera....

I am working off the premise that the Xformers and the speaker are good and that everything else needs to be replaced.

yyr123

United States

Just a Guy who likes to play guitar
Jan 17th, 2019 11:20 PM   Edit   Profile  

Forgot to put the link for the pics

External link

Leftee
Contributing Member
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VA

Toxic Humility
Jan 18th, 2019 05:23 AM   Edit   Profile  

Hello and welcome!

Can’t see the image. It wants me to sign in.

Try Amplified Parts - hit the link in the banners at the top of this page.

yyr123

United States

Just a Guy who likes to play guitar
Jan 18th, 2019 07:44 AM   Edit   Profile  

Maybe this link works?

External link

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jan 18th, 2019 08:09 AM   Edit   Profile  

Highly recommend you don't start replacing parts unless you know they are faulty or badly out of spec. The only parts that a sure thing to replace are the filter caps in the power supply, and perhaps the electrolytic caps across the cathode resistors, and the bias cap. More than likely the 470 ohm screen resistors will be out of spec but unless they are over 20% I wouldn't sweat it.

Antique Electronic Supply is a good source as well as Mouser Electronics (mouser.com).

willie

Leftee
Contributing Member
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VA

Toxic Humility
Jan 18th, 2019 08:39 AM   Edit   Profile  

Ditto what Willie says. That’s all I would do to that amp based on the pictures. That is, barring any other discoveries along the way.

ejm

usa

Jan 18th, 2019 10:03 AM   Edit   Profile  

I'm no expert but from what I've gathered over the years, Willie's post is worth reading a few times.

Depending upon where you live there may be a good competent amp tech that can give you an opinion on how to proceed.

There is a guy in the southeast named Ken Fox who does a lot of vintage restorations.
In addition, I'd guess that some manufacturers of other amps might like to see it as well.


yyr123

United States

Just a Guy who likes to play guitar
Jan 18th, 2019 10:57 AM   Edit   Profile  

wow really? I guessed that the orange drop caps would need attention.

Power Supply caps are the 4 on the board by themselves right?

I will most likely replace all of the pots....which is the reason I stopped playing that thing when I was 16 years old....scratchy all of them.



66tele

USA

66tele
Jan 18th, 2019 01:36 PM   Edit   Profile  

I see no "orange drop" caps in the photos. These are all original signal capacitors (affectionately known as "brown turds"). I agree with Willie...don't just replace parts without determining if they are malfunctioning. You would be spending money unnecessarily and de-valuing the amp. Yes....replace the filter caps (under the dog house), the cathode caps and the bias caps. Replace the screen resistors if they have drifted. This is ordinary maintenance. Do not wholesale replace the the pots! Scratchy pots can be cleaned and lubricated with the proper Deoxit product. Very often this will eliminate the scratchy problem.

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 18th, 2019 01:41 PM   Edit   Profile  

GREAT advice as usual from the experts on this site.

yyr123

United States

Just a Guy who likes to play guitar
Jan 18th, 2019 03:40 PM   Edit   Profile  

wonderful gentlemen...thank you for your astute advice.

I have order the parts and hope to have them next week to dive in.....

Thanks again.

ejm

usa

Jan 19th, 2019 08:29 AM   Edit   Profile  

"Do not wholesale replace the the pots! Scratchy pots can be cleaned and lubricated with the proper Deoxit product. Very often this will eliminate the scratchy problem."

+1.

Scratchy pots is a very common problem with old amps. I fixed a couple of old Peaveys this past year that I picked up super cheap.

Make sure your contact cleaner is "safe for plastics".
And is NOT WD-40.


Liquid Smoke

So Cal, USA

Jan 20th, 2019 02:30 PM   Edit   Profile  

I agree, the guys above are giving you excellent advice. I was fortunate to find a good deal on a '69 Deluxe Reverb on Craigslist 8 years ago. It was all original and the components on the circuit board look very similar to yours. All I did was clean and retention the tube sockets, clean the pots, replaced the electrolytic caps, and installed a grounded power cord. The amp sounds and works perfectly to this day.

It sounds like you may be new at working on amps. If so, my suggestion is to be patient, do more research (like how to discharge caps), ask more questions, the guys here at FDP are very knowledgeable and supportive. Other than the parts mentioned above, it's unlikely much else will need replacing. Overall these amps are extremely durable and reliable.

One thing I noticed on your pics is that some of the solder joints look questionable..like somebody has worked on it before. One of the solder joints on the tremolo bug looks like it's even missing solder on one of the eyelet connection (the one that should be a brown wire leading to the intensity pot). Cleaning up these solder joints would be a good place to start. I also see some wire nuts on the input jacks near the brass grounding plate. Some of the other wire routing to and from the circuit board looks like it's been changed. I would investigate that a little closer too.

Good luck..in the long run you are probably better off with this amp than the Bassman anyway :)

(This message was last edited by Liquid Smoke at 07:49 PM, Jan 21st, 2019)

yyr123

United States

Just a Guy who likes to play guitar
Jan 22nd, 2019 01:45 PM   Edit   Profile  

Liquid I thank you for your input. I just got the caps for the power supply today. I also uploaded a few videos on youtube that will document my progress.

My first attempt at AMP anything, which is strange b/c I got a 2yr degree in electronics and work with PLC and sensors in my day job. I do understand circuit design (generally) and current flow and how the components work, but I am unfamiliar with many things related to tubes and how they function and what readings I am supposed to be getting.

I just got the bug recently when my 93 deluxe reverb's PCB board had some issues.....I asked Fender for a replacement and they said they don't sell them. I got pissed and vowed to never go down that road again.

This amp is a case in point....50 years later I can work on it and fix it. my 93 Blues deluxe is non operable.

yyr123

United States

Just a Guy who likes to play guitar
Jan 22nd, 2019 01:52 PM   Edit   Profile  

Youtube videos - sorry for the quick shots...you you have to pause a bit to look at the guts with more detail.

1. Intro
https://www.youtube.com/watch?v=5xsCAQzrGaY&feature=youtu.be

2. Back
https://www.youtube.com/watch?v=l7zFuxKNftM&feature=youtu.be

3. Cap board
https://www.youtube.com/watch?v=8dl1S6kjyUk&feature=youtu.be

4. Guts
https://www.youtube.com/watch?v=Wdf88ruALeg&feature=youtu.be


yyr123

United States

Just a Guy who likes to play guitar
Jan 22nd, 2019 04:13 PM   Edit   Profile  

Another question. What’s the easiest way to measure the Caps? I know for a true reading you have to take the cap out of the circuit....not really sure how everyone does this ?

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jan 22nd, 2019 06:31 PM   Edit   Profile  

Depends on the cap, what you want to know about it and what you are using to measure or test it with.

If you are wanting to test a cap for equivalent series resistance (ESR) you can (with most good ESR meters) test in-circuit. To measure the capacitance value, you need a capacitance meter and you should unsolder one lead to get a proper reading. If you want to know if an electrolytic cap is shorted or open, you can use an ohmmeter, again with one lead up to get a proper reading.

willie

yyr123

United States

Just a Guy who likes to play guitar
Feb 8th, 2019 09:11 AM   Edit   Profile  

So.....it's back. ( See video clip )

Got the tubes last week and biased....so much easier than new amps.

Replaced the cap board, the bias cap, input jacks with the resistors (metal film not carbon comp) replaced the main volume pots last night on both channels.....

Reverb return isn't working...have to figure out where the signal is dropping out.

Probably replace a few more pots....50 years and those things are sketchy.


Whats the consensus on Socket replacements....does everyone go with Belton's? What's the best if I have to replace one or two?

It's Live the amp is back.

(This message was last edited by yyr123 at 02:39 AM, Feb 9th, 2019)

SoK66

USA

We had the hit but Van got the money
Feb 20th, 2019 12:37 PM   Edit   Profile  

Good advice above. I'd just add that it looks more like a '68 AB568 that's been converted than an AB763. Hard to tell exactly for the few pics. Most of the drip edge AB763s I've seen still had the blue Ajax tone caps. Also seems to have the later 3-position ground switch. Whatever, it can make a breathtakingly great amp.

FDP Forum / Amp Mods, Repairs, and Projects / Restoring a SF AB763 Deluxe Reverb




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