Apparently they use a translucent ceramic.
Jerry W4UK
At 06:33 PM 11/17/2001 -0800, Terry Gaiser wrote:
>It IS normal to see light through the ceramic of those tubes.
>Terry W6RU
>
>----- Original Message -----
>From: "Jerry Flanders" <jflanders2@home.com>
>To: "2" <2@vc.net>; " AMPS" <amps@contesting.com>
>Sent: Saturday, November 17, 2001 5:55 PM
>Subject: Re: [AMPS] bright light
>
>
> >
> > I have powered up this 5cx3000a's filament at full voltage with the blower
> > running to let it age a few hours. I am surprised to see a bright yellow
> > glow down there below the cooling fins. Funny. I assumed CX = ceramic =
> > opaque = no light escaping! Could it be glass instead of ceramic????
> >
> > Jerry W4UK
> >
> >
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