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Re: Warranties?
Warranties? I give a 2 year warranty on retail work (1yr on wholesale).
This is mainly a function of what the other shops in town are doing. We
were all giving 1 year until recently. After I kept hearing: "the other
two shops I called said they give a 2 yr warranty..." enough, I upped it
to 2. It's extremely rare that I have anything come back, so it's mostly
a selling pitch.
As to helium flushing... I experimented a bit using helium as a flush.
While in theory it seems benificial, I am unable to make a qualitative
judgement. I generally have very good success with tube cleanliness,
and I don't really have a good comparison of flushed/non flushed.
I know minute amounts of hydrogen have additional benifits beyond those
of helium alone (the reason nat. gas removes Hg stains). I think I read
somewhere (Eurocom advertisement?) of a flushing gas with a trace of
hydrogen added. Again, other than sounding good I don't have any
evidence to support its use.
When I worked at UT, we used a hydrogen furnace to treat certain metals
before sealing to glass. The metals seemed almost surreally clean after
such a treatment. I have often wanted to incorporate this action in some
way to routine processing, but have not figured a safe/practical/economical
way.
Tom - elaborate on your "manifold side" stopcock.
-John Anderson
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