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A 4-400A amplifier for c.w., s.s.b. or a.m.
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1961/01/page33/index.html
Here the 4-400A amplifier and its control unit are mounted in a 21-inch gray hammertone rack cabinet (Bud CR1727). Shelf brackets (Bud SA-1350) are mounted on both sides of the cabinet to hold the amplifier chassis. The meters …
A 500 Watt Output 4-400A Linear Amplifier For 600 Meters
http://w5jgv.com/4-400A_600M_amplifier/
Output 4-400A Linear Amplifier for 600 Meters By W5JGV - WD2XSH / 7 First Posted on December 14, 2008 An Hybrid Amplifier Designed for the ARRL 600 Meter Research Project This amplifier is capable of 500 watts of RF output …
4-400A HF Linear Amplifier with Tube - Homebrew …
https://www.copblock.org/items/4-400a-Hf-Linear-Amplifier-With-Tube-Homebrew-Excellent-Well-Documented-_363297845199.html
The HF Amp includes a documentation folder & General Electric 4- 400A Power Amplifier tube. The on board Filament Supply runs on 120 VAC - standard wall outlet power.Originally, tested with a 3-500Z that provided excellent results. I didn't get the 3-500Z with the amp but had a good 4-400A tube in the shack.
4-400A
https://frank.pocnet.net/sheets/088/4/4-400A.pdf
Title: 4-400A Author: Eimac Subject: JA-FP-2003-11-25 Created Date: 11/25/2003 9:49:54 PM
4-400 Amplifier - Amfone
http://amfone.net/Amforum/index.php?topic=18084.0
A pair of 4-125s, or 4-400s would make great modulators, and in class AB1 they would need very little in the way of a speech amplifier to drive them. Ranger audio output would certainly be sufficient with the appropriate driver transformer.
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