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
>
> At 04:08 PM 11/17/2001 -0800, 2 wrote:
>
> > >
> > >Most of the light I can easily see comes from the
> > >ceramic body above the suppressor.
> >
> >A ceramic insulator is between the anode and the screen ring. The socket
> >is below that. Is there a suppressor next to the socket?
> >
> > >I try not to
> > >look direct at the light and it is often just seen
> > >as reflections through the PA box holes. It looks
> > >almost incandescent white in operation.
> > >-
> > >Other quick details of the broadcast amplifier
> > >layout:
> > >A single 4CX250 drives the heavily R swamped
> > >input of the 5cx1500B. Everything is strip line
> > >construction.
> > >-
> > >Despite more than average episodes of power
> > >removal (line failures) when running full tilt, the
> > >tube seems fairly hardy and lasts well past the
> > >expected life span.
> > >-
> > >The Station most often bought Econco rebuilds
> > >which worked very well.
> > >-
> > >skipp
> > >-
> > >[snip]
> > >--------- Forwarded message ----------
> > >From: 2 <2@vc.net>
> > >Does light come from the ceramic anode-insulator?
> > >If so, what color is the light?
> > >thanks
> > >
> > >_
>
>
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>
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