Do my tubes need to be biased when replaced?

Power tubes need to be biased by a qualified technician when replaced. Our only model which is exempt from this rule is the Varsity Reverb, which is cathode biased. A matched set of power tubes still needs to be used, however.

Preamp tubes do not require biasing, although please make sure to use the correct type tube in each socket as we use as many as three different model preamp tubes in our amplifiers.