M2(x) uses the voltage over the degeneration resistors as input for the autobias circuit based on the 4n35. Without degen resistors in the OPS, you would not have M2.
Yes, I can see that.......on schematic.....so we need a way to control bias without "degeneration".....
Then there should also be a good "sonic" reason to avoid degeneration.....like lower distortion, lower output impedance....larger class A envelope.....etc....
- Home
- Amplifiers
- Pass Labs
- Pass XA25?