Do I need to rebias when I change power tubes?
The The Viceroy, Rambler, Hammerhead, and Imperial (discontinued) amps do not need to be rebiased when you change output tubes though it is important to use matched sets of tubes. The Slant 6V, Mercury, Raleigh, and and El Moto (discontinued) require rebiasing when the output tubes are changed. See the documentation for a particular model for a more in-depth discussion of that model’s unique requirements.
