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1. [Amps] HB 4-400 amp (score: 1): Author: "Robert" <woodr90@gmail.com>; Date: Mon, 1 Jun 2020 20:38:46 -0500; few years ago, bought amp in progress (SK) that uses two x 4-400 tubes. The sockets (ceramic type) were mounted on bottom of chassis, no spacing If there were glass chimneys, those didn?t make it to; /archives//html/Amps/2020-06/msg00000.html (7,259 bytes)
2. [Amps] HB 4-400 amp (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 2 Jun 2020 09:58:03 -0500; You need to read Eimac document SK-300A Air System Socket. It will give you the socket and chimney for the 4-400A among other tubes. You need the SK-406 chimney. Lowering the socket a bit is okay but; /archives//html/Amps/2020-06/msg00001.html (7,052 bytes)
3. Re: [Amps] HB 4-400 amp (score: 1): Author: "Robert" <woodr90@gmail.com>; Date: Tue, 2 Jun 2020 11:44:21 -0500; SK-400? interesting, the data sheet on 4-400 Tube didn't have that great info. THANKS! 73 W5AJ Robert Midland, Texas You need to read Eimac document SK-300A Air System Socket. It will give you the so; /archives//html/Amps/2020-06/msg00002.html (7,808 bytes)

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