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Author Topic: 4CX5000A bringing out of storage  (Read 153 times)
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AG5UM
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« on: August 05, 2026, 11:04:43 PM »

We have a 4CX5000A/8170 tube,
 with all the transformers, Magnetics, socket,  caps ...etc. etc...saved for a long time. It actually is everything from a 6KW system.
 Thinking...of linear amp configurations and designs for this tube if we decide to build an amplifier with it. Plenty of data sheets, factory info. etc. out there.
Looking through information on designs, looking through the sites for builds and ideas. Fun. Maybe its time to think about doing something with this stuff.
Anyway, having fun thinking about it right now.






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AG5UM
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« Reply #1 on: August 06, 2026, 11:57:59 PM »

Have been looking at a lot of "Grounded Screen", Grid driven, Class AB1 designs for Linear Amps.
Seems to be some classic designs out there.
 Looking at : "John 5-19 Lamia",  Interesting construction of homemade Linear using 4CX5000A tube.
https://5-19lamia.blogspot.com/

Anyway,
 Plate modulated AM transmitter for this tube...have to think about that, Linear sounds much simpler right now.
Still having fun looking at the parts and thinking about it for now.


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W3SLK
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« Reply #2 on: Yesterday at 11:08:24 AM »

That 'jug' has some serious business to it! But an awful lot of electrons pass through it to keep the filament happy! I think I would lash it up first as a linear and drive it with a Ranger of 'transmitter-de-jour' without worrying about going to far with it. I thought Rich Measures, AG6K(SK) built one and it worked pretty good.
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
KD1SH
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« Reply #3 on: Yesterday at 09:42:20 PM »

A plate modulated 4CX5000A would be the cat's tookus!
Seeing as how you've already got the iron and sockets and such, you've got quite a leg up already.
Since the parts came from a transmitter, does that mean you have the modulator tubes and iron as well?
Wow...assuming running this thing full-strap, you're looking at roughly 3500 watts of audio!
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