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Amperex 4-400C Vacuum Tubes - raditubo.com
https://raditubo.com/4-400c
4-400c for sale, Buy amperex prices, ampex 4-400 specifications, 4-400 tube. mpn: 4-400c, model: ... These tubes are beasts and would look awesome in a high power audio amp. These are extremely expensive if purchased new. I was able to light the filaments as a partial test, see pictures. Physically they look to be in very good condition.
The WA2FNQ 4-400 Transmitter
http://www.wa2fnq.com/4400/4400.htm
The WA2FNQ 4-400 transmitter was designed to interface with the linear AM transmitter in an auxillary/main configuration. Keying voltages, VFO and modulation monitoring are provided by the linear AM transmitter. Transmitter selection and additional antenna switching are provided by the 4-400 transmitter.
Tube 4-400A / 8438 / QB4/1100GA / RS 1002 A
https://www.tube.be/4400a.html
TUBE 4-400A / 8438 / QB4/1100GA / RS 1002 A GENERAL DESCRIPTION The 4-400A / QB4/1100GA / RS 1002 A is intended for use as amplifier, oscillator or modulator. The low grid-plate capacitance of this tetrode couples with the low driving power requirement allow considerable simplification of the associated circuit and driver stage.
4-400 tube amplifier - YouTube
https://www.youtube.com/watch?v=LZXB9FEpDGE
Turning on the B+ On the 4-400 amplifier
4-400 Amplifier - Amfone
http://amfone.net/Amforum/index.php?topic=18084.0
4-400 Amplifier +1 AMfone! ... there is plenty of room in that chassis to shoehorn in a second tube. Used 400s are cheap and plentiful. ... I run a 4-250 at 1650V, modulated by 811s which are driven directly from my Ranger's mod iron (with the audio gain pot only up to 4). 15W out of the Ranger gives a comfy quarter-kilowatt with gobs of ...
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 are for grid, screen and cathode currents and plate voltage.
Data for two 4-400a's operating AB2 in grounded grid ...
https://forums.qrz.com/index.php?threads/data-for-two-4-400as-operating-ab2-in-grounded-grid.401695/
Use the 4-400 tubes as you would 3-500's in any 3-500 amp. If your amp normally uses 3-500 tubes you will want to short out the zener diode. Just jump a wire across it so you are running zero bias. This will make the 4-400's idle a bit higher so that you will need less drive and get more power output.
4-400 Linear Amplifier Project - YouTube
https://www.youtube.com/watch?v=eVwJvJHDSb0
This is my 4-400 10 meter amplifier project. Its grounded grid so it should be good for AM and SSB .
PrimaLuna Evo 400 Tube Power Amplifier — PrimaLuna …
https://www.primaluna-usa.com/primaluna-evo-400-tube-power-amplifier
PRIMALUNA EVO 400. POWER AMPLIFIER. EVO 400 Poweramp. $5,295 Stereo / $10590 Monoblock Pair. Dare to Compare. Compare PrimaLuna construction to any other brand, at any price. You'll be amazed. REMOTE CONTROLLED TRIODE/ULTRA-LINEAR SWITCHING. Do you have some classic rock albums you used to love so much that have now ended up left on the shelf ...
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 in linear operation on the 600 meter band. The RF drive requirement is less than 50 milliwatts.
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