bias

New member here, does anyone have any information on biasing the Sonzera 20 combo please? I've looked on line and searched this forum with no luck. Don't need to do it now, but will in the future and given the adjustment can be done from the outside, thought I'd like to know details. Thanks in...

Does anyone know what the plate voltage is for an Archon 50? I'm installing El34's. Does anyone know the recommended bias point for El34's?

My archon had 5881's that were both dead on 30mV. I just put in some new Mullard El34's and after adjusting, the bias pot is maxed. One tube shows 27.6 mV and the other, 24.7mV. Is this a huge deal being that they are supposed to be 30mV? This is my first tube amp I've had to bias and I'm not...