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FDP Forum / Amp Mods, Repairs, and Projects / 64 Pro: vibrato takes a minute to work...why?

Contributing Member

Calif. Foothills

Nov 21st, 2017 01:08 PM   Edit   Profile  

My favorite amp has a slow onset of vibrato....it always comes on and works properly, usually after 1 or 2 minutes....I've not observed this in my other Fender amps....perhaps I need to replace a component...Any help much appreciated! Thanx, Rinto



Nov 22nd, 2017 01:56 PM   Edit   Profile  

Are you sure that the 12AX7 in V3 is good?
If so, how about its cathode bypass ecaps?

(This message was last edited by pdf64 at 03:57 PM, Nov 22nd, 2017)

Contributing Member


watch sunrise from the bottom of the sea
Nov 24th, 2017 01:11 PM   Edit   Profile  

Had the same problem in my 61 super, and it was as pdf64 suggested, a vibrato circuit cathode bypass cap.

Contributing Member

American Patriot

About as ordinary as you can get.
Nov 24th, 2017 08:11 PM   Edit   Profile  

I've also seen this in my Fender amps but only one now and then. 12AX7? I thought Vibrato used a 12AT7.
Sounds like a tube to me.

Contributing Member

So. Cal. USA

Nov 27th, 2017 09:56 AM   Edit   Profile  

12AX7 is correct. The 12AT7 is typically used for a reverb driver and phase inverter in Fenders but not all.

FDP Forum / Amp Mods, Repairs, and Projects / 64 Pro: vibrato takes a minute to work...why?

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