>
>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
>
In FM broadcast service, 8281/4cx15,000As emit blue light through the
anode insulator. However, this phenomen can only be seen when no chimney
is used in the design.
cheers, Jerry
>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
>> >
>> >_
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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