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FDP Forum / Amp Mods, Repairs, and Projects / Troubleshooting Reverb-Supersonic 60

jbear

USA

Jan 16th, 2019 10:56 AM   Edit   Profile  

Hey All,
Traded for a Supersonic 60 (1st version) and didn't get to try it first. That's cool...I know the risks. The reverb doesn't work and when I turn the pot up it starts to squeal around 3-4...no actual reverb...just the squealing.
Before I start messing around with it (and no worries...I will not do any more than tube or tank changing). What would be a good safe diagnostic approach for a non-amp tech guy?
Thanks all!

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 16th, 2019 11:47 AM   Edit   Profile  

Squealing in a reverb circuit often means a poor connection somewhere. First things to try:

Check the reverb send/return cables between the chassis and the reverb pan.

Remove and replace the reverb drive and recovery tubes with known good tubes; make sure the tube sockets have enough tension.

Blow out the reverb control pots with non-lube contact cleaner (do all the other pots while you're at it).

jbear

USA

Jan 16th, 2019 12:56 PM   Edit   Profile  

Thank you! I'll try those things.

jbear

USA

Jan 16th, 2019 01:52 PM   Edit   Profile  

Anyone have a picture of the tube layout label? This one is missing.

jbear

USA

Jan 16th, 2019 02:54 PM   Edit   Profile  

So...no mic tubes based up the pencil tapping technique, but one looks like it's not glowing at all. This amp is pretty well-worn and there's a hodgepodge of preamp tubes, so...who knows. Power tubes are JJ's and look fairly new, but I just go ahead and change out all of the PA tubes. Hope that remedies the issue. I've done quite well with trades but this one...maybe not so much. I traded a Les Paul Studio...one of green/gold from the late 90's-early 00's with the small trap inlays...ugly as S**T, but not a bad player. I was tired of having in around. Always wanted to try a Supersonic, so... Should have walked when I saw the exterior, but I was in WTF mode, so...grab n' go. Live and learn. Hopefully a happy outcome...can always use a pedal. Friday trading my Carr Hammerhead for a Dr. Z Remedy + Cab...that'll work out much better!

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jan 16th, 2019 04:20 PM   Edit   Profile  

With OT on your left looking at the top of the chassis...tube Left to Right. top V-8 thru V-4...Bottom is V1 thru V10. V6, V4 and V9 are 12AT7's, the other preamps are all 12AX7 and the output tubes are of course 6L6GC. The reverb driver is V9 and the recovery/amp is V10. Be sure to check the reverb tank as they are weak link.

willie

jbear

USA

Jan 16th, 2019 05:06 PM   Edit   Profile  

Thank you! I think V9 is the unlit tube.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jan 16th, 2019 07:06 PM   Edit   Profile  

Is it hot or warm to the touch? Sometimes you cannot see the lit filament, but for sure there is a chance there is a bad solder joint on one of the filament pins on the V9 tube socket.

w

jbear

USA

Jan 16th, 2019 08:27 PM   Edit   Profile  

Hey Willie...I'm also near Atlanta.
I'm hoping that is not the case...don't want to spend on this amp. Guess I'll know when I change out the tube.

jbear

USA

Jan 16th, 2019 08:38 PM   Edit   Profile  

If I can ask for clarification...if I am looking from the back of the amp...the row farthest from me (closest to the grill)...the tubes on the far right...are those 9 and 10?
Thanks for bearing with me...I have a spacial learning disability! It's why I have to play by ear...can't sight read. Takes me forever to triple pre-check my soldering when I work on my guitars. I don't give up though!

jbear

USA

Jan 17th, 2019 09:17 AM   Edit   Profile  

So...interesting. This buckethead has all 12ax7's in there...no 12at7's...there's a start.

Leftee
Contributing Member
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VA

Jan 17th, 2019 10:41 AM   Edit   Profile  

That is most-likely your issue. Easy fix!

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jan 17th, 2019 12:45 PM   Edit   Profile  

Here ya go jbear. This may well be the only online image of the tube chart for a fender supersonic 60. I made it up from the tech manual. Just copy and paste the url to your search window.

https://ibb.co/gjrWx0g

I doubt the 12AX7s would keep the reverb from functioning at all, but I would certainly encourage you to retube the amp properly.

willie

(This message was last edited by willie at 02:48 PM, Jan 17th, 2019)

rfrakes331K
Contributing Member
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IL USA

RonHalen Jokingly He Says
Jan 30th, 2019 08:46 AM   Edit   Profile  

Does it sound like a Vibrolux Reverb?

FDP Forum / Amp Mods, Repairs, and Projects / Troubleshooting Reverb-Supersonic 60




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