[AMPS] bright light

[Jerry Flanders]

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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