Yes one like a car window only with no glue. The other 2 developed hairline
cracks when picked up.  Ira will check further when I get back home. May be
knock offs but who would have made them?

Clarke

Sent from Verizon Note 2


On Sep 7, 2017 2:52 PM, "Tomasz Kowalczyk" <ten.ko...@gmail.com> wrote:

> What do you mean by "disintegrated"? Did it break into thousands of
> pieces, like a car window?
>
> W dniu czwartek, 7 września 2017 19:32:45 UTC+2 użytkownik Clarke Payne
> napisał:
>>
>> as far as I can tell temperature changes were not "radical".  packed in
>> solid thick plastic case with no stress. tube pins look straight. will
>> check with magnifying glass. ones that broke when I picked them up
>> developed hairline cracks immediately.  one just disengrated. when I get
>> home will post pics and on the others will do a comparison of segments.
>> Thank you guys for your input. will do some more investigation. the only
>> other thing that may be remarkable is the broken ones have no markings. the
>> unbroken ones have the Burroughs b-7971 stamp.
>>
>> Clarke
>>
>> Sent from Verizon Note 2
>>
>>
>> On Sep 7, 2017 1:07 PM, "gregebert" <greg...@hotmail.com> wrote:
>>
>>> I had none in storage, and the ones I purchased in the past year had no
>>> signs of stress. Is it possible yours were damaged in storage ? I've never
>>> seen glass weaken on it's own. Also, the pins are fairly rigid (unlike
>>> IN-18's which are quite soft) so if there are any bent ones, it suggests
>>> the tube was stressed while stored.
>>>
>>> I suggest you carefully inspect the base for glass-cracks, then
>>> bench-test them. If you are into data-collection, I suggest gathering I-V
>>> data for each segment on each tube, then plotting and comparing. It takes a
>>> bit of time, but I'm glad I did it for mine.
>>>
>>>
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