Sorry, but it is in french...
3 type of bias:
*fixed bias by cathode resistor feedback (example AC30 VOX)
*fixed bias by fixed tension bias on grid tube power (example: Peavey Classic30; Mesa Boogie F50, dual rectifier, etc)
*adust bias by adjust tension bias on grid power tube (example: JCM800 Marshall type, Peavey Windsor head, Peavey VK100, etc). You need to adjust the bias only on this case!
For Fixed bias, you don't need adjust bias, just changed your power tube.
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