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RSD & Zaerix 811A Type 811 and 811A is an HF/VHF transmitting power triode designed for RF amplifier applications, featuring robust cons...

United Electron 811 Type 811 is an HF/VHF transmitting power triode designed for RF amplifier applications, featuring robust construction an...

RCA & TUNG-SOL 12B4A The 12B4-A is a single indirectly heated low-mu triode originally designed for TV sets for use in the vertical defl...

SYLVANIA 12B4A The 12B4-A is a single indirectly heated low-mu triode originally designed for TV sets for use in the vertical deflection uni...

General Electric 12B4A The 12B4-A is a single indirectly heated low-mu triode originally designed for TV sets for use in the vertical deflec...

TELEFUNKEN ECC801S Triple-Mica SEALED! One of the best of its kind. These have triple mica and diamond mark in the bottom. These older 1960...

TELEFUNKEN ECC801S Triple-Mica One of the best of its kind. These have triple mica and diamond mark in the bottom. These older 1960's EC...