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CV257 MOV HOUSEKEEPER SEAL VALVE, 1943

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CV257 MOV HOUSEKEEPER SEAL VALVE, 1943

CV257 Triode Valve used in VHF power amplifiers, with the Anode connected by a Housekeeper seal (the copper disc), invented by A.A.A. Housekeeper, who solved the problem of bonding ductile metal to glass.

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