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Re: [Amps] 4CX1000A

Subject: Re: [Amps] 4CX1000A
From: "Roger (K8RI)" <>
Date: Fri, 27 Jan 2012 16:32:22 -0500
List-post: <">>
On 1/27/2012 4:23 PM, Roger (K8RI) wrote:
> 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?
I forgot to mention that most of these tubes run reverse screen current 
with low drive and power levels.  Mine (4CX1500B/FU728F) only goes to 
positive screen current near the US legal limit output.  At that point I 
tune for max screen current.


Roger (K8RI)

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