What Is An 813 Transmitter

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K6JCA: AM Transmitter, 813 Style, Part 2 (Modulator Deck)

K6JCA: AM Transmitter, 813 Style, Part 2 (Modulator Deck)

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K6JCA: AM Transmitter, 813 Style, Part 2 (Modulator Deck)

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K6JCA: AM Transmitter, 813 Style, Part 2 (Modulator Deck)

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

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Transmitting valves
813 / GM70 amplifier with Bartolucci transformers

813 / GM70 amplifier with Bartolucci transformers

Let's Add AM To The 813 Transmitter!! - YouTube

Let's Add AM To The 813 Transmitter!! - YouTube

813 Class C - Plate Modulated Transmitter Final Deck - First Light

813 Class C - Plate Modulated Transmitter Final Deck - First Light

120w Two Tube 813 Transmitter - YouTube

120w Two Tube 813 Transmitter - YouTube

Anyone have any ideas which version this may be?

Anyone have any ideas which version this may be?