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4CX250K - RF Cafe Forums
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| nubbage |
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Post subject: 4CX250K
Posted: Mon Feb 19, 2007 9:47 am
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 343
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Hi
Does anyone have a complete datasheet for the coaxial tetrode tube 4CX250K?
Everyman and his dog on the web can sell me any quatity, but no-one gives a datasheet
showing which electrode is which.
BTW I have tried the Eimac web site without success,
as they just give a photo image and the basic characteristics. I am really looking for
the full data, preferably with circuit design graphs.
G3OAD
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| wb9jtk |
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Post subject:
Posted: Mon Feb 19, 2007 10:58 am
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Joined: Tue Dec 26, 2006 5:39 pm
Posts: 58 |
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| nubbage |
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Post subject:
Posted: Mon Feb 19, 2007 11:10 am
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 343
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TKS OM
The 4CX250K is the same as the 250B electrically, but mechanically it is fully
coaxial, and so does not use the same B8F/SK610 8pin base. It has annulus rings like
the 2C39BA.
However, I cannot find anywhere which rings are the screen grid, which
the control grid and which the cathode.
The heater rings are obvious enough -doh.
TKS AGN
G3OAD
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| fred47 |
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Post subject: 4CX250K connections
Posted: Wed Feb 28, 2007 4:00 am
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Joined: Wed Feb 22, 2006 3:51 pm
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Hi!
It's simple - you can't cross concentric circles without shorting or breaking
them.
So after the heater, going out from the center, you have the cathode, the
control grid, the screen grid, and of course the upper enclosure is the plate. They can't
come in any other order, because they're rings - cylinders - and the structure of a vacuum
tube determines the positioning of the electrodes and their connections.
Good
Luck!
Fred AC7--
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| nubbage |
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Post subject:
Posted: Thu Mar 01, 2007 4:48 pm
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 343
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Ahh-so I had not appreciated the internal construction as well as the outside was
entirely planar concentric cylinders. Alimentary, my dear Watnot  Thanks Fred 73 Nubbage
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| sm7ovk |
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Post subject:
Posted: Wed Sep 12, 2007 7:02 am
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| Captain |
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Joined: Thu Jan 11, 2007 12:59 pm
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Hi,
I have found a datasheet for the 4CX250K tube, but it's in "paper-format".
Are you still interested? I'll can scan it and mail it to you directly.
73
Jens
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| nubbage |
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Post subject:
Posted: Fri Oct 05, 2007 7:07 am
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 343
Location:
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Hi Jens
Sorry for late reply. I have been on vacation and away from internet access.
(Difficult to achieve these days.)
I have now found the data sheets thanks. All
is clear.
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Posted 11/12/2012
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