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Sun May 13 10:46:53 EDT 2007

400's? Instead of a pair of those Class C... Concider using a a single
4-1000A Class C modulated with a pair of 4-400's Class AB1 at about 2500
Volts ("low" power, 1KW). I use 304TLs AB1 with my 4X1 rig because I had
them. However... I think that a pair of 4-400's Class C modulated by a pair
of 4-400's AB1 would be ideal. Common tubes can be a plus these days, and
two 4-400's are lower price than a single 4X1. Well, If you can get the 4X1
final in there... go for it and use the 4-400's for the mudulator. BTW, I
think the 4X1 may have less plate interelectrode capacity than the 4-400
pair if your concidering TEN meters AM (tank circuit concideration).
George KC

-----Original Message-----
From: amradio-admin at
[mailto:amradio-admin at]On Behalf Of Shirli Sieb
Sent: Tuesday, March 19, 2002 2:13 PM
To: amradio at
Cc: jec at
Subject: RE: [AMRadio] Class C modulation

From: Ed Sieb, VA3ES:

On Tuesday, March 19, 2002 12:53 PM, John Coleman wrote:

> I can't really understand why any one would want to run a pair of
> 4-400s as  finals in class C.
> Maybe Class B or AB but not Class C.
> I think they would make a much better AB modulator for a single
> 833.

Why do you say that, John?  Many 1KW BC rigs used 4-400 pairs for the
class C stage.

Just curious what your reasoning is.

Ed,  VA3ES

Ed Sieb, VA3ES  		va3es at
P. O. Box 8377, Ottawa Terminal, Ottawa, Ontario,  K1G 3H8
613-738-8924  (H)
AMI #529  Canadian Division Director.
Member - Radio Club of America,  QCWA,  AWA
Net Manager - Canadian Boat Anchor Net (3745 Kcs)

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