Adjusting BIAS in Sovtek Tube Midget 50H Head

[eremitalf]

Hi everyone,


I recently bought new power amp tubes (Sovtek 6L6WXT - matched pair) and preamp tubes (JJ 12AX7) to my sovtek tube midget50H amp.
I wanted to know if I need to adjust the bias of the tubes and if so how do I do it in this particular amp.


Thanks everyone.
Regards
Luis