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

To: "Jim Brown" <>, <>
Subject: Re: [Amps] 4CX250B Ratings in Dentron Clipperton V
From: "Carl" <>
Date: Sat, 22 May 2010 16:34:30 -0400
List-post: <">>
Your tuning for a peak BUT not exceeding the tubes screen current rating. 
The Load cap controls the amount of Isg once the Tune control is set for a 
resonance indication on the screen meter. They interact a bit.

Tuning is very similar to a GG amp with both using a grid current as the 
best indicator.

You can keep an eye on the grid current but its mainly to keep the drive to 
a safe level. Since this is a modification has the grid circuit tuning been 
optimized? If not do that first at low power.


----- Original Message ----- 
From: "Jim Brown" <>
To: <>
Sent: Saturday, May 22, 2010 1:22 PM
Subject: Re: [Amps] 4CX250B Ratings in Dentron Clipperton V

> 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?
> 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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