Another B-25 Question

[trem]

It looks like the grid input impedance (is that the right term?) for V1 and V2 is 5.6M. Is there any reason I could not change that to a 1M on V2?
Thank You

[AL30]

It looks like the grid input impedance (is that the right term?) for V1 and V2 is 5.6M. Is there any reason I could not change that to a 1M on V2?
Thank You

[ATTACH]6090[/ATTACH]

This is a great read and it should help.

Designing Common-Cathode Amplifiers


AL

[trem]

This is a great read and it should help.

Designing Common-Cathode Amplifiers


AL

Thank you very much, I appreciate it.

[tekhed7]

trem, make sure to check the resisitors to Pins 3 & esp pin 9 of V3, the driver tube of the beast.
They often drift upwards &/or go open. They set grid voltages & can cause serious distortion if off-value.
That input grid resistor on V1 that you point out isn't anywheres as critical. The amp will work quite well whether it's 2.2, 5.6 or 7 Megs.

[trem]

trem, make sure to check the resisitors to Pins 3 & esp pin 9 of V3, the driver tube of the beast.
They often drift upwards &/or go open. They set grid voltages & can cause serious distortion if off-value.
That input grid resistor on V1 that you point out isn't anywheres as critical. The amp will work quite well whether it's 2.2, 5.6 or 7 Megs.

Thanks for the info. Guess I should have just come right out and asked, "would it cause problems to use the more standard 1M input resistor"?
The PCB in my amp was a complete loss. So I gutted everything and am just having to hand wire it all. So all new components and preamp sockets. Fortunately the rocker switches seem to be in good shape.
Thanks Again