On Jul 30, 2006, at 2:03 PM, Steve Thompson wrote:
>
>
> R L Measures wrote:
>>
>> 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.
> Sorry, I think I didn't make myself clear. When did Eimac change their
> recipe?
>
I don't know. However, probably around the time that the 15E came out.
> Thanks,
>
> Steve
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|