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An 813 Amplifier Project

813 / GM70 amplifier with Bartolucci transformers

A low cost 600 watt ultra-linear amplifier - IW5EDI Simone - Ham-Radio

K2VCO 813 Class-C RF Amplifier
813 SE triode amps

813 se trans impedance amplifier

My 813 Linear Amplifier

two 813 tube linear.

IWISTAO BLOGGER : 813 (FU-13) Vacuum Tube Amplifier Classical Diagram