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mathog mathog is offline
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Default Inexpensive replacement for a He/Ne 20 mW laser?

Samuel M. Goldwasser wrote:

1135Ps are available surplus in
excellent working condition for a small fraction of the new price.

Where? The ones I have seen on ebay are pretty iffy - no estimate on
remaining life, usually they don't even say if the tube is known to
work. Plus I don't know if it is the tube or the power supply blown.

Is there a simple way to test the power supply at the leads that go into
the tube? The power supply is out of reach in a part of the instrument
case that I could not disassemble. (There is no instrument service
manual.) None of the voltmeters at my disposal can handle kV
measurements, at least not directly.