Every Commander amp that I have added QSK and vacuum relays to has had the
blue glow when looking through the cooling fins..
The three holer on my desk, with brand new 3cpx800 tubes, glows blue. The
ten year old 3cx800 tubes also glow blue.
The tubes are full output, and there is no issue. I believe the glow which
appears when cut off bias is removed, may be dependant upon the trace
elements in the ceramic, with different types of ceramic producing somewhat
different colors.
Your amp is fine, you don't need to worry, just operate.
73,
Mike
W2AJI
----- Original Message -----
From: "Steven Hanlon" <asciibaron@comcast.net>
To: "k7fm" <k7fm@teleport.com>
Cc: <amps@contesting.com>
Sent: Wednesday, November 12, 2008 10:28 AM
Subject: Re: [Amps] help with corona discharge
> > Are you, by chance, operating at 20,000 feet?
>
> nope, about 160 or so.
>
> -Steve, WM3O
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