• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Jadis da7

Can anyone explain how that cross linked feedback from the output tube plates to the drivers is working?

All of that interconnectivity creates a lot of interdependencies, making maintenance that much more complicated. Does the sound justify it?
 
This model does not use a switch for the standby function, there are powered time delay modules that could be put, but in this amplifier I do not know where to cut the high voltage. I can put the scheme of the source, but I do not know if the relay supports that voltage, it it occurs to me to quote the negative.