Vol. 6, No. 4April 18, 2023August 15, 2023By Libby3 View Fullscreen On the Cover The Eimac X272 developmental tetrode from 1944 – a 4-125A with three radial pins added to reduce lead inductance. In this issue TCA Special Publications Eimac Introduces the 4-125A W. E. Broadcast Gear – From Turntables to Tubes Pushuing the (Tube) Envelope The Tube That Jack Built Anton and Amperex Eimac and Gammatrons
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