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09-11-2019, 02:57 AM
Thanks for the input Kevin.
Unfortunately I am tied into using what is available in this amp to do the switching.
It is another of those horrible flexi Fender PCBs and I am stuck with the 2 relays fitted and all those suspect traces.
I am hoping that I can achieve a good result by using what is available, with a little bit of modification.
I have been told by another Tech, who had done this job to a few of these amps, that he just utilised the Bypass via Relay 1B - shorting the top of the Volume pot to the grid of V1B - and it worked fine for him. I was just not sure that having the output from V2B also connected to the grid, was not going to inject some noise, despite the whole stage 2 being shorted out via the Bypass.
Relay 2 is a DPDT and one pole's function is switching ground to the Master Volume in Drive mode, with the other contact having no connection. The contact, shown with NC in my drawing, is the one that is actually connected to the Master Volume.
This leaves the possibility of using that unused contact, when the relay switches to Clean, to place ground on to the juction of the 100k & 1M resistors. This will ground the V2B output via the 100k and the 1M will be grounded and then be in parallel with the 510k, as part of Rg of V1B.
What is your opinion of this approach?
Cheers, Noel
Unfortunately I am tied into using what is available in this amp to do the switching.
It is another of those horrible flexi Fender PCBs and I am stuck with the 2 relays fitted and all those suspect traces.
I am hoping that I can achieve a good result by using what is available, with a little bit of modification.
I have been told by another Tech, who had done this job to a few of these amps, that he just utilised the Bypass via Relay 1B - shorting the top of the Volume pot to the grid of V1B - and it worked fine for him. I was just not sure that having the output from V2B also connected to the grid, was not going to inject some noise, despite the whole stage 2 being shorted out via the Bypass.
Relay 2 is a DPDT and one pole's function is switching ground to the Master Volume in Drive mode, with the other contact having no connection. The contact, shown with NC in my drawing, is the one that is actually connected to the Master Volume.
This leaves the possibility of using that unused contact, when the relay switches to Clean, to place ground on to the juction of the 100k & 1M resistors. This will ground the V2B output via the 100k and the 1M will be grounded and then be in parallel with the 510k, as part of Rg of V1B.
What is your opinion of this approach?
Cheers, Noel
