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Re: [Amps] 4CX250B Ratings in Dentron Clipperton V

Subject: Re: [Amps] 4CX250B Ratings in Dentron Clipperton V
From: Roger <>
Date: Sat, 22 May 2010 16:27:11 -0400
List-post: <">>

On 5/22/2010 1:22 PM, Jim Brown wrote:
> On Fri, 21 May 2010 19:32:43 -0400, Roger wrote:
>> The screen is the most sensitive tuning indicator and particularly so at
>> the higher power settings.
> So if I watch the screen current, am I tuning for minimum?

In the final stages of tuning a Tetrode amp you are peaking the screen 
current with the loading control. This peak coincides with maximum 
output, or should and is a sharper peak than the output.
If the screen current is excessive, back off on the drive a bit and 
retune. The max screen current should also come with minimum grid 
current for any specific drive. IOW, increasing screen current decreases 
grid  current.


Roger (K8RI)
> Do I need to watch grid current, or will that take care of itself if the
> screen current is right?
> Many thanks for all the great responses, both on and off list. Very helpful.
> 73,
> Jim K9YC
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