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QC Vacuum Tubes - Cathode ray tube
QC Vacuum Tubes - Thyratron power tube
Heathkit Assembly Manual Vacuum Tube Voltmeter
Three Makers of Vacuum Tube History Popular Science Monthly
Radio owned by Herman and Minnie Roundtree
Star type 201A "detector / amplifier" tube
Concert Master type 201A tube
Munder type 201A "Volutron" triode
Munder type 201A "Volutron" triode
Western Electric type 201A telephone repeater triode
Justrite type 201A "DisXron" triode
Western Electric type 201A telephone repeater triode
George H. Clark Radioana Collection