Biasing a 5150II ?!

[Botch]

Does anyone know how to do it and what the bias should be set to?! Any help or useful links would be much appreciated! Cheers guys!

 

[disassembled]

The range of Bias on a 5150II is really narrow so just turn the knob until it sounds good to you. If you really want to get into how to do it then get something like a weber bias right and get the measurements of plate voltage and current draw to determine the best setting for you tubes.

Greg