Supersymmetry Circlotron

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In an poweramp with this topology you dont have to use batteries on the inputs.
I use batteries to be able to use higher values in the feedback, but still have the amp DC coupled. But a power amp can easely drive 47 ohm feedback resistors, and that is what the 2SK170 like on their sourcepins to give 3-5 mA current.
 
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