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RE: X-Ray Transformer on eBay

Original poster: "Godfrey Loudner" <ggreen@xxxxxxxx>

Hello Ivan

At first I thought 30kv was too low for diagnostic x-rays, but my
reference book says otherwise. I've seen these small medical
transformers sell for up to $280 on eBay. They are probably useful if
the output is rectified for cap charging, but they are rather useless
for making AC arcs. With mild ballast, they make pretty good arcs, but
the primary coils get blazing hot in a matter of seconds. With more
ballast, a thin string like arc can be sustained. Even with three
identical dental transformers in parallel, I got no impressive results
without running the risk of burning the primaries. A better arc can be
pulled off a 15kv, 60ma NST! Also x-ray transformers are rated in peak
voltage, so this one is really 21,000v rms. However this particular
transformer does looks interesting in that the secondary coil is
encapsulated and not placed over the primary. If one could disassemble
the core and get it back together again, the primary could be replace
with a lower gauge wire to run hotter. One should count the number of
turns on the discarded primary. Only the big x-ray transformers counts
towards impressive arcs.

Godfrey Loudner

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, May 04, 2005 1:23 PM
To: tesla@xxxxxxxxxx
Subject: X-Ray Transformer on eBay


Original poster: tesla@xxxxxxx

I saw this, and bit on it once and was outbit.  I decided I didn't
really need to kill myself with it (I have plenty of 15kV stuff for
that) and figured I'd let everyone here know about it.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7512508903

Nice thing about this one is the input is 120VAC line voltage.. no need
for a driver circuit.

--
Ian Smith
www.ian.org <-- My Homepage full of "Stuff"