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K2VCO 813 Class-C RF Amplifier
two 813 tube linear.
813 SE triode amps
813 se trans impedance amplifier
K6JCA: AM Transmitter, 813 Style, Part 1 (PA Deck)
A low cost 600 watt ultra-linear amplifier - IW5EDI Simone - Ham-Radio
HF 813 Linear Amplifier | Jet Propulsion
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