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Description
Early broadcasting station KFDB, 1922, primary oscillator power amplifier (six pilotrons in push pull, 2,000 volt storage battery for plate supply). Ralph M. Heintz.
Type
Image
Format
Black & White
Identifier
F82BD858-D112-4E32-9878-308636119120 2003-33-42
Subject
KFDB (Radio station : San Francisco, Calif.) Nineteen twenties Heintz, Ralph M., Sr
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