Tube Amp Bias - Default vs Min THD and Bode plot on the Line 6 Spider Valve 112 (#003)

See the full video here: https://rumble.com/vl6por-tube-amp-bias-default-vs-minthd-and-bode-plot-on-the-line-6-spider-valve-11.html
An experiment in biasing a tube amp.
Comparing 2 methods:
1. The recommended default bias of 35mV (=35mA)
2. Biasing for minimum % THD at 1kHz.

Additionally showing the amplitude vs frequency response of both methods.

Finally and audio comparison of the 2 bias methods.

Видео Tube Amp Bias - Default vs Min THD and Bode plot on the Line 6 Spider Valve 112 (#003) канала SeventyV