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Re: [Amps] 4CX1000A

Subject: Re: [Amps] 4CX1000A
From: "Roger (K8RI)" <>
Date: Fri, 27 Jan 2012 16:23:17 -0500
List-post: <">>
On 1/27/2012 3:46 PM, Roger Dixon wrote:
> Hi Chaps,
> I recently completed my 50MHz 4CX1000A amplifier.  However the Eimac pull I
> have had for a while suffers from excessive secondary emission.
Are you familiar with Tetrode tuning?  At what level of screen current 
do you start getting secondary emission?

> The question.  I have recently obtained a NOS 4CX1000A.  However, despite
> being offered as an "Eimac" NOS, both the valve and the original box are
> branded General Electric.  Does anyone have any views as to the
> quality/specification of a valve such as this that is non Eimac branded?
I've not heard of any problems with GE constructed 4CX1000A's. GE has 
built a lot of high powered tubes in the past and particularly for the 
I'd not be concerned about a GE tube, unless some one comes up with 
information on a problem with those tubes.


Roger (K8RI)
> Roger - G4BVY

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