FENDER TWIN REVERB BLACKFACE VOLTAGE CHART

[wawa]

Can anyone offer a voltage chart vs pin on a Blackface Twin conversion.
I have seen these for the Marshalls, just not Twin reverbs.
Only for ease of rerfrence.

[Structo]

What circuit is it and what do you mean by conversion?
Are you modding a silverface to blackface specs?

Most older schematics of the Fender amps have voltages on them.

You just have to adjust for higher primary voltages of today's wall voltage.

Most of the 50's and 60's amps have 110 or 115v as their primary voltage.
Unless you have a variac that you can set to those voltages, you will have to do a little math for the percentage of increase down the line for the DC voltages present.

http://www.schematicheaven.com/fenderam ... _schem.pdf

[wawa]

I was hopping there was a conveinent voltage chart for AB763 spec. i'm converting a 69 Twin Reverb to Blackface. I have seen them done on marshalls.

[jaysg]

Yeah...but it's not like they were real consistent - either brand. The schematic values are generally taken as nominal, however, some of those are +20%/-5% despite the schematics saying +/-20%.

[Structo]

Yes and if you are within 20% +- of the voltage listed you are probably fine.
It would be interesting to take an exceptional amp that has gorgeous tone and measure all the voltages just to see what's going on inside.