• 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.

Output stage biasing, with the driver stage

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Have I got this figured right?

The idea is that since balance in the P-P transformer is determined by 'all other things being equal' then the driver stage for the output tubes needs to be looked at too, and if I can loose a coupling cap too then great

Also am I correct in thinking that sharing a single reference voltage between both the output tubes will promote balance in the output transformer?

Finally, this is limited to class A operation I know but it was drawn to get the idea down, which might be perfectly common....

Thanks for any pointers in advance.

Andy

[Edit] forgot to add that the basic layout for the output servo is lifted from an original by Andy Nehan published in Glass Audio in '93 - any errors are all my own though.
 

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