• 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.

Screen drive

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No expert by any stretch but don't screen drive amps often use sweep tubes? And IIRC a fairly low primary impedance OPT? I could (probably) be way off base.

Why not build a conventional PP amp using 6BM8 (4 tubes = stereo PP amp) or 6AQ5 tubes? 12K might be about right for them.

S.
 
A screen-drive amp requires a low impedance drive that can source significant current. It also has large voltage drive requirements so you have to develop lots of swing at low distortion.

It is an advanced-level amp to make. If you are at the level where you need to copy a schematic, it is probably better to go with a more standard approach.

If you are up to the significant design challenges, I have a circuit with some experimental results for developing large voltage swing at tiny distortion that may be relevant here.
 
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