Pot-Belly Bulbs

[P3D Kevin Evans <kevans@xxxxxxxxxxxxxxxxxxx>]

I am a short-time subscriber to the list and unfortunately an infrequent
reader,  I have a technical problem that I need some help with.

I recently purchased a 1960's (or ?70's) vintage Compco Stereo Model 500
projector.  Two stereo slides can be mounted in the sliding carrier.  The
carrier activates a shutter so the system cuts out while the carrier is
slid to the opposite side.  The light source is two CZA 500 watt bulbs.  It
blew one of the original bulbs shortly after I bought the projector, so I
picked up a couple of "WIKO" bulbs from a distributor, thinking I would
have a replacement and spare.  The replacement lasted three seconds, and
the spare lasted for a couple of hours.  Each time the bulbs were blown
when I powered up.  The blown bulbs have sort of distended pot-belly
bubbles on their front sides.  I was careful to handle the bulbs with
gloves while installing them, and I even switched the one remaining
original to sort of empirically test the receptacle prior to the last one's
self-destruction.  So I have a few questions...

Is the projector circuitry faulty, or are the "south of the border" bulbs
the problem?

If the bulbs are defective, has anyone successfully recouped their loss, a
little over $40 in this instance, from a distributor or manufacturer?

Does anyone know of an inexpensive source for quality projector bulbs?

Does anyone have experience retooling old units to bring the light source
up to date?

Assuming the projector is working properly, how much is it worth?


Waiting with pot-bellied bulbs
and belly-up projector,

Kevin





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