Help Again!

[ken newman]

Thanks to all for the help on my HW-101 o-rings. It was really a quick
solution to a problem.
 My next question is: can anyone tell me where to get a large and small
display tubes for my
Sb-634. They are Heath part numbers, 411-286 and 411-804.
 The Sb-634 is used and all that I can find wrong is that the large tube
is weak and the small is not working at all. Again, thanks for past and
future help!
Take  care, Ken... kb4bjm

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