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K2VCO 813 Class-C RF Amplifier
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My 813 Linear Amplifier
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K6JCA: AM Transmitter, 813 Style, Part 1 (PA Deck)
813 SE triode amps
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813 linear amplifier. Lets add a tube!
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813 se trans impedance amplifier
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813 triode connected SE
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813 / GM70 amplifier with Bartolucci transformers