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I don't know about the alignment. My experience was with the opto-chopper in
the 410C. Mine was replaced as a unit by the company cal lab.

There are only a very few wire pigtail Ne's made. I think there was a means of
ID'ing which is in there by looking very carefully at the glass pinch area.
There is something stamped into the glass as I remember. You might ask someone
like BulbDirect that specializes in lamps.

Best,
-John

Christian A Weagle wrote:

--- In

<mailto:hp_agilent_equipment%40yahoogroups.com>hp_agilent_equipment@...,
J Forster <jfor@...> wrote:

Many Ne bulbs have minute amounts of radioactive material in them to
stabilize the firing point. As the radioactive emission rate decays, the
bulbs become erratic. Put in new bulbs, if you can.

That was my first impulse; however, the manual (paragraph 5-27) states
that "physical alignment and selection of the neon bulbs are critical"
and that replacement of the entire assy is the only thing to do.

Can you speak to this at all? If I _do_ replace the neons, are
standard NE-2 bulbs the right thing to use?

Thanks for your help!