When i got my old superlead, it had had a little work done, i removed what wasnt stock when i did the caps. All bar the jumpered inputs. I like them that way.
With this plexi im doing now, i want just a single input, but both channel volumes. Just trying to work out the effective grid resistance that the amp sees now with the inputs jumpered. And what value to run them, and whether it should just have bridged inputs on the tube, fed from a single 68K, or something else.
I had a look inside a local amp builders amp recently, and he has a single input , 1 meg to ground, direct to the bass side of V1 (tweed bassman style amp) then a 33k across the input pins to the bright side of V1. It has split cathodes as well, plexi values. Amp is quiet as a mouse and sounds killer.
This is what im thinking of trying.
Hmm, might get the meter on the JMP see what that reads.
Jumping inputs, grid R value?
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azatplayer
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Re: Jumping inputs, grid R value?
A typical Fender 68k/68k /1M hi-Lo input reads 34k with 1M to ground on teh Hi input and 68k with 68k to ground on the low input. So if you just want one, then 33k with 1M is ideal. If you use 68k with 1M, it will audibly knock off highs when you roll the geetar vol back.