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

Subject: Re: [Amps] 4CX250B Ratings in Dentron Clipperton V
From: Rob Stampfli <>
Date: Sat, 22 May 2010 17:00:15 -0400
List-post: <">>
On Sat, May 22, 2010 at 04:27:11PM -0400, Roger wrote:
> 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.

Never having had a tetrode amp, I feel compelled to ask:  Should you
always tune such an amp for a peak reading (within the acceptable
range for screen current) and not add a tad bit of loading for linearity,
as one normally should for a triode amp?  (If you're going to add some
load anyway, what is the advantage of having that nice sharp peak?)

Inquiring minds.

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