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.
Thanks,
Steve
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