6C4 RCA NEW ORIGINAL MILITARY BOXED VALVE TUBE (G15C) - Langrex
RCA 6C4 Tube USA, 1966, New, Hickok Tested Good | eBay
Early Military Grade RCA JRC 6C4 Black Plate Tube NOS in Box - Etsy
6135/6C4 GE 5 Star, Medium Mu Triode Tube. Designed to be used as a local oscillator in very high frequency receivers. New old stock. No longer available for export. MFR: GE. SKU:
6C4 / 6C4WA / 6100 NOS/USA
6C4 electron tube front stage, high resolution, single triode, 5Z4P bile rectifier. Frequency Response: 10Hz-40KHz -
6C4 @ The Valve Museum
GE 6C4 vacuum tube new old stock mint condition General Electric tube - Etsy Italia