[Amps] Anode Impedance of 4-400A

David C. Hallam dhallam at rapidsys.com
Tue Nov 15 17:31:33 EST 2005


Eric,

For a parallel pair of 4-400A's, use plate voltage divided by 1.8 times the
DC current.  That will give you an value for impedance that is close enough
for all practical purposes.

David
KC2JD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of Patti
Sent: Tuesday, November 15, 2005 3:45 PM
To: amps at contesting.com
Subject: [Amps] Anode Impedance of 4-400A


Does anyone know the 'rough' load impedance of a pair of 4-400A's with 3500V
on the anode?

In some of EIMAC literature (W6SAI AS-1 Publication), there are tables,
which list it as 5000 Ohms.  Is this for one tube, or two?

The 1982 ARRL Handbook contains a design with a pair.  The PI network values
listed there, equate to a load of 5000 Ohms, with a Q of about 12.


I am just trying to cross a few items off of my list.
If someone can contact me off list, I would appreciate it.

Thanks
Eric Thielking

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