Charlie,
With an 8877, two bias settings aren't necessary. You'd gain a bit more
efficiency on CW and slightly ower heat dissipation in the room, but that's
about all. It's pretty important with tetrodes, however, since on many tubes
a high resting current is necessary on SSB to keep distortion products low..
I wouldn't bother doing it for your homebrew amp.
73,
Jim W8ZR
> -----Original Message-----
> From: Amps [mailto:[email protected]] On Behalf Of Charlie
> Sent: Monday, January 11, 2016 11:17 AM
> To: [email protected]
> 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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