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813 / GM70 amplifier with Bartolucci transformers

K2VCO 813 Class-C RF Amplifier

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RE: Schade feedback or RH amp with fixed bias? - Chip647 - Tube DIY Asylum

HF 813 Linear Amplifier | Jet Propulsion

K6JCA: AM Transmitter, 813 Style, Part 1 (PA Deck)

An 813 Amplifier Project