A musical instrument or a microphone input transformer driving an electron tube stage with no plate or anode voltage supply. See previous posts.
Distortion here means electron tube processing at the peaks or large signals.
Small signals can still be in the linear part of the transfer characteristic.
Microphone signals for example can be small. And the earth itself is flat for small travels around a stationary or operating point.
The no plate supply stage can then drive another such elcteontube stage or a JFET and then even a bipolar transistor can be driven.
The concept here is getting the electron tube processing as early or closest to source as possible.
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