On Jul 30, 2006, at 12:10 PM, Steve Thompson wrote:
>
>
> R L Measures wrote:
>> On Jul 30, 2006, at 8:18 AM, Tom W8JI wrote:
>
>>> When the Chinese were making 3-500Z tubes with regular glass
>>> and holes were sucking in the sides, Rich concluded it was a
>>> VHF parasitic that couldn't be seen or measured. This VHF
>>> oscillation supposedly caused dielectric heating of glass at
>>> VHF.
>>
>>
>> Correct. Rus Healy at QST was the first who told me of this
>> phenomenon. However, it took Eimac a while to come up with a glass
>> recipe that would not melt at VHF, so I was not surprised that the
>> Chinese initially encountered the same difficulty.
> Do you know when this was? I'd like to know which date codes to avoid.
Early 1991.
>
> Thanks,
>
> Steve
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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