A Simple Clamp circuit for a Classic Tetrode Transmitter

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W3DBB:
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K1DEU:
Seems off topic but in the 60's my Three tube 813 Linear? was swamped G1 input with a 100 watt non-inductive 300 ohm resistor fed by a 1:4 balun. G2, Screen grid voltage was developed by rectifying this G1 RF with a voltage doubler using two 6AU4 Television Damper Diodes. This was developed from an article by G2DAF. Oh yes lotsa output when driven by my Drake T4X or Johnson Ranger but very dirty on SSB. It constituted a  SBE (Frequency cleaner/eraser) Transmitter. Very efficient with 2700 EP under load, 3200 no load, zero bias. John, K1DEU

Steve - WB3HUZ:
Similar to the one posted by NU2B some time ago.

WA1GFZ:
Gee,
Take a viking 2 and convert it to screen modulation. That sounds like a good source for an afterburner...

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