6C4WA

Ruggedized miniature 7-pin medium-mu single triode used as a local high-frequency/VHF oscillator, RF mixer, or low-noise small-signal audio voltage amplifier. Equivalents: 6C4, 6C4W, 6100, CK6100, EC90, CV133, CV4058, M8080. Real-Life Examples: Heathkit AR-3 shortwave receiver, Eico 232 VTVM meter, ARC Type 12 military aircraft navigation radio, Collins 75A-1 receiver.