Pull the tubes and run them thru the dishwasher to remove any
contaminants on the ceramic.
You may also see a buildup on the chimneys.
Carl
KM1H
----- Original Message -----
From: "Steve Hanlon" <asciibaron@comcast.net>
To: <amps@contesting.com>
Sent: Tuesday, November 11, 2008 6:38 PM
Subject: [Amps] help with corona discharge
>i am seeing a corona discharge around both tubes in an amp - the blue
> glow is visible if you look down through the cooling fins - the tubes
> are 3cx800's. any ideas on what would cause this? the corona is
> visible at about 10w drive and increases in intensity to 50w. it
> occurs
> on both tubes and the two replacement tubes.
>
> it looks exactly like a gas burner on the stove, a blue glowing
> "flame"
> dancing around at the base of the tubes.
>
> the amp is a Commander HF-2500
>
> -Steve, WM3O
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>
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