Farfisa FR-40

[UlricvonCatalyst]

Nice work. That, or something similar, was the first amp I ever got to play my electric guitar through. My friend's dad used it with his Transicord and occasionally we were allowed to plug into it. We used to plug a mic in too for some reverb-drenched singing.

[Racing]

I hear ya.
To this day,i live in Europe since long,i´m on the lookout for the first one i ever used.

A Gibson super medalist. TBH they sound of a dead cat approx...but i fix . Just need to find one worth the effort.

[Yvan44]

Hi,

i'm new in this forum i've seen this rebuilt....awesome!

here's my fr40 i've just bought, before rebuild :



first step woulb be to change the ecaps, check everything is ok, then upgrade!!

regards

y

[s_mcsleazy]

i wanna plug a baritone into this and i have no idea why

[Whoops]

Seing B+ and so forth it turned out that bias voltage,PT carries separate taps for that,was way to low. No WAY i was gonna get the voltage needed to control this thing with the ideas i had i mind.
Well. Voltage doubler time. See..them taps ALSO runs rectified heaters for two of the preamp tubes AND the voltage needed for the AC-151 transistor.
A voltage doubler setup tho handled the whole thing flying colours. Got me 66VDC raw...which is ample enough.

Hello,
I'm working in the same exact amplifier at the moment, I'm also dealing with the problem of too Low Bias voltage.

Could you please show or describe what voltage double circuit did you use?

unfortunately all the photos links in the post are dead

thank you so much