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Openclipart
50 Watt Oscillator Vacuum Tube
2013-11-08T18:37:23
Illustration taken from "THE RADIO AMATEUR'S HAND BOOK" 1922.
https://openclipart.org/detail/188512/50-watt-oscillator-vacuum-tube-by-damauk-188512
damauk
amp
amplifier
electrical
electronics
oscillator
tube