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1. [Amps] 4-400 W Screen Voltage (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sat, 28 Jan 2012 17:18:06 -0800; Has anyone run 4-400s with screen voltage successfully in an amplifier with passive grid (50 ohm load for the grid drive)? I have the hankerin to build an amplifier with 3 of them. It will be 160-10; /archives//html/Amps/2012-01/msg00242.html (6,799 bytes)
2. Re: [Amps] 4-400 W Screen Voltage (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 28 Jan 2012 21:27:54 -0500; I dont see any reason why not. Ive done it with 4X1's and passive grid is used by a few current manufacturers with external anode tubes. National did that back in 1962 with the NCL-2000.....the rest; /archives//html/Amps/2012-01/msg00245.html (7,977 bytes)
3. Re: [Amps] 4-400 W Screen Voltage (score: 1): Author: "David C. Hallam" <dhallam@knology.net>; Date: Sun, 29 Jan 2012 15:24:27 -0500; I have built several passive grid driven tetrode amps with normal screen voltage applied. One was with 4-400's and the other a 4CX1500A. I currently use a Johnson Invader 2000 which is a passive grid; /archives//html/Amps/2012-01/msg00269.html (9,754 bytes)

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