Vol. 2, No. 6April 18, 2023July 19, 2024By Libby58View FullscreenOn the Cover The 15D prototype UHF triode.In this issueReaders ReportEarly Raytheon QK-TypesThe Sparton VG-1 “Viso-Glo” Tuning IndicatorHeartbreak on the test FloorThe Saga (orElegy) of the SD-1065SockettesConstruction Trends in Radio Tubes
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