Lyon does not use the term "automatic biasing, instead they describe an "intelligent auto-fixed-bias (AFB) circuitry that does NOT operate during normal listening. Biasing Ayon Triton III is performed in two distinct and separate phases as follows (my words, shortened from the manual):
1) Upon power up, the user can manually depress a detent on the rear of the unit. This initiates a process that tests each tube in turn and sets a bias for all tubes.That bias is then used for subsequent power ups.
2) In addition, each time the amp powered down and if the current operation time exceeds 45 minutes, the tubes are automatically rechecked and if necessary, a new bias is set for each tube. This is referred to as "bias reference control".
The operation of this circuit can be observed on the back of the unit via 8 LEDs that blink in sequence from V1 through V8. If the process passes without tube problems then the LED is left dark and the next tube in the sequence is tested. This process also means that the power button does not kill power to the unit, rather it initiates power up and power down, and under circumstances (a tube failure during the last power on, or a user initiated detent press).