Solid State Guitar Amp Forum | DIY Guitar Amplifiers
Solid State Amplifiers => Amplifier Discussion => Topic started by: jman on August 15, 2019, 09:31:08 PM
Any one know how to set the bias on this amp? schematics are found under Rivera era amps.
Before adjusting the 'bias' of the output section, I would suggest that you measure where it is set at the moment.
Measure the voltage (in MV's) across either R14 or R15 (the ballast resistors).
There is not a Fender specified bias level on the schematic.
Adjusting P2-B potentiometer will either increase or decrease the current draw of the output section at idle.
Being a Class A/B output I would go for the lowest setting that just gets it out of crossover (Class B) distortion.
Thank you for that info on biasing.