Tube question guys

[JoeE SP9]

No. The bias adjustment on a power amp is for balancing the push and pull of the output stage. The higher absolute output voltage level of the new preamp will have no effect, per se. A lot of tube preamps have high output voltages. I've seen them as high as 20 volts. When you combine that with the necessary current, you have the ability to drive long IC's and weird loads.

[Feanor]

No. The bias adjustment on a power amp is for balancing the push and pull of the output stage. The higher absolute output voltage level of the new preamp will have no effect, per se. A lot of tube preamps have high output voltages. I've seen them as high as 20 volts. When you combine that with the necessary current, you have the ability to drive long IC's and weird loads.

Makes sense. For a given volume of sound, the power amp will "see" the same voltage from the new pre as from the old, it's just the new pre's output will be more attenuated vs. its maximum.