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Re: [Amps] grid bias supply

To: Steve Flood <>
Subject: Re: [Amps] grid bias supply
From: Larry <>
Date: Sun, 16 Mar 2008 13:08:01 -0700
List-post: <">>
Yes, it is. There is great value in being able to adjust your bias to 
allow more efficient operation while running non-linear modes such as 
CW, RTTY, and the various WSJT modes.

Class B or even soft Class C is much easier on your tubes than the 
"linear" classes. Of course it requires that the operator have some idea 
of whats going on inside the amp in order to properly adjust for the 
various requirements of each class.

73, Larry

Larry - W7IUV

Steve Flood wrote:
> I was looking at an amp design from a 1959 issue of GE Ham News.  Two 813s 
> grounded-grid linear.  What makes this design different from the others I've 
> looked at is the addition of an adjustable grid bias supply.   What 
> functionality does this feature add?  From what I could glean from the text, 
> it is used to set the zero-signal plate current to 40 mA for SSB tuneup, and 
> for "almost zero" plate current for CW tuneup. Is this amp trying to operate 
> in two different classes?
> Steve KK7UV 
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