I personally miss the tube glow from the first amp I built. It had
that beautiful 4PR1000A with 6KV on the plate.
That glow was a thing of beauty.
Gary
KA1J
> 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
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