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FDP Forum / Fender Amps: 1985 - Current / Fender Twin Amp (pro tube series) weak reverb



Jul 5th, 2016 03:49 PM   Edit   Profile  

Dear members!

My Twin Amp made in 2002, has all 12 tubes replaced with new ones Groove Tubes. The reverb tank it's new, also. However, the amp with reverb at 10 seems to have a shorter reverb compared with a Twin Reverb at 5! Is that normal?

I want to use massive reverb and the twin amp could not get it. is there something wrong with my amp, or have I choosed wrong the amp to buy?

Thanks in advance!

Steve Dallman
Contributing Member

Merrill, Wisconsin

Age is just a number...mine is big
Jul 12th, 2016 07:07 AM   Edit   Profile  

The reverb circuit is standard for Fenders. Even the reverb tank is the same type (long tank, long decay) as a Twin Reverb. The only difference is the switching, which in the Pro Tube, uses FET's and includes two 1.5k resistors in series. Those resistances are pretty low and shouldn't attenuate the signal noticeably.

Make sure V7, the reverb tank driver, is a 12AT7.

I am leaning toward something possibly wrong with the amp or tank. But I can't say for sure without the amp to check it out.



Jul 12th, 2016 04:00 PM   Edit   Profile  

It's a 12at7...
Reverb at 10 it's equal to reverb on TR at 4/5.
So strange.

Contributing Member

Too Near Atlanta GA

Amp Tech Emeritus
Jul 14th, 2016 06:57 AM   Edit   Profile  

Even a new reverb tank can be defective, as can new tubes...and make sure it is the right replacement for the original.


FDP Forum / Fender Amps: 1985 - Current / Fender Twin Amp (pro tube series) weak reverb

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