>
>At 04:43 AM 11/18/2001 -0800, 2 wrote:
>
>> >
>> >
>>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.
>>
>Must be from some kind of corona discharge from the HV. It cannot be from
>tube/element heat if it is blue. Is ordinary corona blue?
>
/ As I understand it, when high velocity electrons strike the ceramic
insulator, they bump its electrons up into a higher orbit. When an
electron slows down and falls back to its original orbit, it emits a
photon -- i.e., the ceramic fluoresces. A similar blue glow occurs when
electrons strike some types of glass.
cheers, Jerry
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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