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FDP Forum / Fender Amps: Vintage (before 1985) / cheap simple cooling fan for Rivera-era Fender amps

Stratopastor

Stockton-on-Tees

all your tone are belong to us
Mar 27th, 2016 04:39 PM   Edit   Profile   Print Topic   Search Topic

I developed this for the Princeton Reverb II but it will almost certainly work with the Super Champ, Deluxe Reverb II, Concert "II" and Twin Reverb II. (It's no good for the Champ II or Bassman 20 due to the absence of footswitch facility.)

linky

amp mad scientist

USA

Apr 1st, 2016 07:09 AM   Edit   Profile   Print Topic   Search Topic

Fender amps don't really need fans...
I wonder how 2 zillion survived without a fan? How odd...
I wonder how Fender amps could be the most reliable amps in the world...without a fan? Puzzling...

But
A bigger fan moves more air at a (given) slower speed (lower voltage).
(compared small fans which sound like mosquitoz)
Therefore quieter for a guitar amp, if you must have a fan.


guitarcapo

U.S.A.

Apr 5th, 2016 01:47 PM   Edit   Profile   Print Topic   Search Topic

The foot switch on those amps is wired off the bias feed. I know they were trying to be practical but it does tax the bias supply to the point that it's hard to bias some power tubes down with my Concert II amps. I would just be careful to check the bias on your amp if you add the fan...especially if it pulls more current than the foot switch does.

stl80

USA

stl80
Apr 6th, 2016 08:31 AM   Edit   Profile   Print Topic   Search Topic

Someone put a fan in a Twin Reverb before I got It. I took it to my tech for a tune up and he said,"Someone doesn't know how to bias".
Jim

Stratopastor

Stockton-on-Tees

all your tone are belong to us
Apr 8th, 2016 05:23 AM   Edit   Profile   Print Topic   Search Topic

Thanks for the advice. I have just checked the bias on my PRII with and without the fan after a decent warmup. I'm just measuring from the outside with a bias probe, so I don't know what's happening to the actual bias voltage; but the plate voltage and cathode current appear to vary by less than one percent, which is probably less than the margin of error on my little DMM. Not having access to a Concert "II", I will add a rider to the web page... thanks again.

FDP Forum / Fender Amps: Vintage (before 1985) / cheap simple cooling fan for Rivera-era Fender amps




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