Audiophilepure

https://www.stereophile.com/content/octave-audio-mre-220-se-monoblock-power-amplifier

Pre-measured tubes arrive in a separate box, with amplifier positions labeled for the power tubes. If you use these, you’re golden. If you want to roll tubes, manual bias adjustment is necessary. Turn the front-panel bias selector knob to the tube you wish to bias, then use the supplied small screwdriver to adjust the trimmer screw next to the tube. Yellow and green LEDs located between tubes V2 and V3 indicate if bias is too low, correct, or too high. Combinations of yellow and green allow you to tweak bias higher and lower according to tube choice and loudspeaker type. Sayeth the manual, “Certain loudspeakers may benefit from the higher bias current, as it will increase the damping factor and provide slightly better control of the speakers.” BIAS Low corresponds to a plate current of 33mA, and BIAS high to a plate current of 40mA.

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