VacuumTubeEra

Test Instruments

Do-It-Yourself Vacuum Tube Voltmeter (VTVM) (7 pages, 170 KB, .pdf)

Mechanix Illustrated Tube Tester - August 1949 (6 pages, 6.5 MB, .zip)

Precision E-200 Signal Generator Schematic - 1940 (1 page, 2.4 MB, .pdf)

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