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

Rinto
Contributing Member
*********

Calif. Foothills

Nov 21st, 2017 01:08 PM   Edit   Profile   Print Topic   Search Topic

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

pdf64

UK

Nov 22nd, 2017 01:56 PM   Edit   Profile   Print Topic   Search Topic

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)

groovemaster
Contributing Member
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USA

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

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

BbendFender
Contributing Member
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American Patriot

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

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.

Hammond101
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So. Cal. USA

Nov 27th, 2017 09:56 AM   Edit   Profile   Print Topic   Search Topic

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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