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

[Carl]

The FCC did it!

Originally the rule was 1000W DC input  for any mode. Then it changed to 
2000W PEP for SSB only so the plate transformer was tapped and a switch 
added,

Some of those older amps have a pretty wimpy transformer and not suited for 
heavy duty CW use in the SSB position.

The Ameritrons with that switch change the bias but it  never goes into 
Class C. Instead it is in fairly Deep Class B in CW with a much lower idle 
current which also works well in AM. The HV doesnt change.

Carl
KM1H


----- Original Message ----- 
From: "Charlie" <charlie at drhabekost.com>
To: <amps at contesting.com>
Sent: Monday, January 11, 2016 1:16 PM
Subject: [Amps] Need for bias switch (CW/SSB)


> Folks-
>
> I am putting a 8877 amp together. I was wondering why  some amps have a
> "CW/SSB" switch.
> Assuming the power supply can handle cw key down, other than higher
> efficiency, what other reason could there be for this switch?
>
> Thanks!
>
> Charlie N6CFH
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