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Eimac 4CX

Se7en

Well-Known Member
Jun 27, 2010
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Are These accurate specs:

Plate Dissipation (Max.) 25,000 Watts
Screen Dissipation (Max.) 300 Watts
Grid Dissipation (Max.) 180 Watts
Frequency for Max. rating (CW) 230 MHz

That's 25 thousand Watts output right? and it's a 25LB tube:blink:
 

AudioShockwav

Extraterrestrial
Staff member
Apr 6, 2005
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Sierras Near Yosemite National Park

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Se7en

Well-Known Member
Jun 27, 2010
4,576
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73
Ca

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
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A 4cx ?????
there are many in the 4CX series of tubes..

Data sheets on RF power Tetrodes

Are you looking for BIG tubes?
Air Cooled?
Water Cooled?
Vapor cooling?
One with a Pond out front ?
Look at the 4CN300,000 Tube.
http://www.g8wrb.org/data/Eimac/4CM300000GA.pdf



All you need is a Hydro-electric power plant to run it.....

Below is a Smaller version.


Actually Jeff that is a test set up for Eimacs two million watt transmitter tube.


Triode Electronics-Mega Ongaku!
 

Shockwave

Sr. Member
Sep 19, 2009
3,780
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That's 25 KW worth of dissipation, not output. Unless the amplifier is only working at 50% efficiency you should be able to achieve over 25 KW output in AB1 service. Those are just guidelines for continuous duty service, not intermittent communications service where it could safely do far more with ample cooling. "Homebrew" projects utilizing tubes like these are often more limited by the design of the power supplies and RF deck rather then the tubes capabilities.
 

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
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Kind of like using a pair of 4CP250B's to make 10Kw in radar service. I dare say that most people are concerned with what a tube will do in voice service and some even care about what they will do in clean AB voice service. A few care about class C voice service (yuck) and almost nobody cares about pulsed service. :D
 

Shockwave

Sr. Member
Sep 19, 2009
3,780
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Given enough mic gain and accompanying RF cutoff, I do believe some people have figured out an alternate voice mode utilizing pulse. May require a little tweaking to get a desired duty cycle though.
 

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