On Tue, 02 Sep 2003 21:45:21 -0700 Miles
wrote:

Nope. The manual does not give any specs or equivalent parts. This is
a circa 1960's kit. The bulbs I have do not have any markings on them
at all. Possibly faded with age. I found with a bit of searching that
a few heathkit bulbs with very close P/N's are NE2 bulbs. If thats what
the ones I need are then it will be easy to find a modern replacement.
It puzzled me because the series resistor used with these is 470K which
seems high.

Are these just wire leaded (baseless) bulbs? If so, then an NE-2 is
probably what they used. These were common then, and I think you'd get
useful light and extremely long life out of one with a 470K in series.

Look at the schematic, too. It's possible that it was not driven off
the AC line. If it's driven off the B+, then the 470K becomes more
reasonable.

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Jim Adney
Madison, WI 53711 USA
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