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Re: [Amps] Need for bias switch (CW/SSB)

To: Steve Flood <>
Subject: Re: [Amps] Need for bias switch (CW/SSB)
From: Vic Rosenthal <>
Date: Sun, 17 Jan 2016 19:26:09 +0200
List-post: <">>
Close to cutoff is class B. If the amplifier has a combination of fixed bias 
plus some way of generating additional bias when driven (e.g. a grid resistor 
in a grid-driven amp) then it can move deeper into class C as drive increases. 
This is a way to reduce CW clicks and still have the efficiency of class C. 


> On 17 Jan 2016, at 3:36 PM, Steve Flood <> wrote:
> I have an adjustable bias where I can run a little ZSAC for Class AB.  But I
> can dial the bias until it *just* cuts off and I often use this setting for
> CW.  What class am I running when I do so?  I've heard it informally called
> class B/C.   Running CW at that setting, or even a little deeper bias into
> Class C territory does not create any reported key clicks here.
> Steve KK7UV
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