[Top] [All Lists]

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

To: "'Charlie'" <>, <>
Subject: Re: [Amps] Need for bias switch (CW/SSB)
From: "Jim Garland" <>
Date: Tue, 12 Jan 2016 08:48:13 -0700
List-post: <">>
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. 
Jim W8ZR

> -----Original Message-----
> From: Amps [] On Behalf Of Charlie
> Sent: Monday, January 11, 2016 11:17 AM
> To:
> 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
> _______________________________________________
> Amps mailing list

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>