Randall RB120

[pontiacpete]

Does anyone have a schematic for a Randall rb120?

[The Dude]

I don't have a schematic, but recently worked on one. What sort of problem are you having?

[pontiacpete]

Channel 2 has a lot of noise that sounds like dirty pots. When I tap on the first transistor on that channel it sounds noisy. So I was thinking of changing it.

[pontiacpete]

So this channel starts crackling a lot when increasing the volume on the 2nd ch. Taping on the first transistor in line off of the input jack creates a noise as if it were microphonic. Turns out that this is a JFET , TIS58. I installed a 2N5457 and now there’s no crackling.