twin reverb (2)

bias resistor change from 33k to 22k to increase the bias, bias hotter to achive better tone IMO..

increase the bias by reducing negative supply to grid(pin 5) from -40v to about -35v..

plate voltage (pin 3) - 460 v (all 4 tubes)

S.grid voltage (pin4)- 450v (all 4 tubes)

- bias ~ -35v

change all coupling caps for preamp and trem chatode ,change all filter caps due to old one already burst out...