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FDP Forum / Fender Amps: 1985 - Current / 04 Super Reverb '65 RI ???

taylor

Yes

Jan 4th, 2012 12:16 PM   Edit   Profile   Print Topic   Search Topic

Out of warranty. Needs fixed. Hoping to fix without throwing a bunch of money at it.
Took it to the amp tech at the dealer where it was bought new. He made it worse for 70.00.

Makes snap, crackle, sizzle with an occasional noise like a needle across a vinyl LP. It does sometimes go for several minutes without making any weird noises.

Would a book on How to Repair Your Tube Amp, have any useful info that would relate to these re-issues ?
Just looking for simple basic ideas first then higher tech later.
If it's only filter caps, I'm sure I could do that. Other parts and wiring issues, I'd need help.

Twangmeister
Contributing Member
****

"I'll have cheese

grits with my cheese biscuit"
Jan 4th, 2012 03:47 PM   Edit   Profile   Print Topic   Search Topic

Try cleaning the tube sockets. See post at top of Amp Mods and Repairs for more information.

taylor

Yes

Jan 4th, 2012 04:11 PM   Edit   Profile   Print Topic   Search Topic

Did that the other day, still the same noises.

But, Thank you very much for the responce.
Any ideas are more than welome at this point.

SoK66
Contributing Member
****

USA

We had the hit but Van got the money
Jan 4th, 2012 08:40 PM   Edit   Profile   Print Topic   Search Topic

Sounds like preamp tube racket to me, but could also be a bad plate resistor or two. Easy peasy to fix. Tap on the preamp tubes one at a time with a chopstick, etc and see if one or more accentuates the noise.

taylor

Yes

Jan 9th, 2012 03:24 PM   Edit   Profile   Print Topic   Search Topic

Did the chopstick test.
Results, The two AX's behind the vib. ch., quiet.
Two AX's behind norm. ch. made some noise.
The AT behind norm. ch. quiet.
The AT behind vib. ch., made noise.
I switched the AT's with the same result.
Tapping on the tubes did not seem to bring on the loud crackle/sizzle/scratch noise.

Rick Plays The Blues

Austria

May I try that again?
Jan 9th, 2012 10:57 PM   Edit   Profile   Print Topic   Search Topic

"I switched the AT's with the same result."

What you mean? Same tube made noise or same position made noise?

IIs the noise there when the amp is still cold and comes with temperature?

taylor

Yes

Jan 10th, 2012 10:09 AM   Edit   Profile   Print Topic   Search Topic

Same position or socket.
Turned on power, then probably 7 minutes, flipped on standby. Then the loud crackle/sizzle/scratch.
Settled down after about 3 to 4 minutes. Then did the tap test. Let tubes cool, switched the AT's.
2nd test did not carry-on with the loud c/s/s for minutes, after flipping standby. But, it does return after playing for a half hour or so.


Rick Plays The Blues

Austria

May I try that again?
Jan 10th, 2012 10:54 PM   Edit   Profile   Print Topic   Search Topic

You already cleaned the sockets, but I still believe this is the tube sockets. But not necessarily dirt. I had a similar issue once and it was a socket that did not hold the tube's pins sufficiently tight.
It was exactly as you describe. Issue coming from same socket. Different tubes helped (maybe different pin diameters?) but never cured completely. Bending those little pin retainers inside the tube socket again helped, but not to my satisfaction. Had an amp technician swap the tube socket and then it worked properly again.

Of course, it may as well have been a bad soldering contact on the tube socket e.g. plate resistor connection that got cured by swapping the socket and trying to bend the pins and swapping tubes just altered the bad contact but slight movement of the contacts.

However, any failure occurring just partially and usually after heating up usually is a contact issue due to small variations of size (length of cables etc) and crackle as well.

Taylor II

usa

Aug 21st, 2016 02:30 PM   Edit   Profile   Print Topic   Search Topic

It's been a few years, but it is fixed.
Took it to a good local F/Auth. tech who isn't affiliated with any of the music stores.
He said my amp had him and Fender scratching their heads. Seems it was a combination of transformer a few caps and a tube. He also said that the store tech, instead of removing a bad cap, just soldered another one on top of the bad one.
I just wanted to thank everyone and post the end result.

FDP Forum / Fender Amps: 1985 - Current / 04 Super Reverb '65 RI ???




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