Dave,
Thanks a million for your reply; you have given much to think about.
Bob in Bellflower.
On Sun, 31 Aug 2014 19:29:51 -0400 David Speck <Dave@xxxxxxxxxxxxxxxx>
writes:
> Bob,
>
> I don't see any transformers in the photo list that you indicated,
> but
> with the description of a 100 amp line filter, I'd guess that the
> setup
> is for a utility pole (a.k.a. pole pig) transformer.
>
> These usually were run backward to transform 240 VAC at high current
>
> into 5 - 25 KVA of 14,400 volt output, at a current rating depending
> on
> the size of the transformer in question. 5 or 10 KVA units were the
>
> most commonly used ones among TC builders, unless they were going
> for
> truly monster coils. Transformers bigger than 10 KVA tend to be
> unmanageably heavy unless you have a dedicated lab with a smooth
> concrete floor and a crane to handle them.
>
> These were once readily available from D. C. Cox for something in
> the
> ~$250 price range, plus LTL truck freight shipping, which ran
> another
> $250. You could buy several for just a slightly greater S&H charge
> if
> they went to the same destination. I remember doing a group buy of
> 5
> pieces for myself and 3 friends about 12 years ago.
>
> Regrettably, D. C. has passed away and so has the last easy source
> of
> pole transformers available to the TC builder community. Another
> transformer rebuilding outfit that was once available to TC
> experimenters will no longer sell to mere mortals.
>
> I did a quick scan of eBay, and found some reasonably suitable units
> in
> the $800 - 1500 range, plus shipping. If you are patient and
> lucky,
> you might find one at a lower price eventually. Large industrial
> potential transformers may get you from 0.5 to ~2 KVA in a single
> package, but these tend to be expensive, unless you are lucky enough
> to
> find one at a bargain price.
>
> A series stack of 4 beefy microwave oven transformers can deliver a
>
> respectable ~8800 volts at ~500 mA, or ~4.4 KVA, which competes
> favorably with the best of the potential transformers, and is way
> cheaper.
>
> Probably the best avenue now is to get one from another coiler who
> is
> moving on to SSTCs. The days of big iron disruptive coils are
> numbered,
> though IMHO they are simpler and more bullet proof than the SSTCs.
>
> You might also investigate DC resonant charged TCs. I believe that
>
> Richie Burnett in England has a magnifier system that makes 10 foot
>
> discharges with only two microwave oven transformers in series as a
>
> power supply. These are a lot easier to acquire and transport,
> though
> the coil design is a bit more complicated.
>
> Dave
>
>
> On 8/31/2014 1:38 PM, rd_parker@xxxxxxxx wrote:
> > A couple of questions if I may: 1 - what would be the cost of a
> > transformer such as you are displaying, and 2) what is the
> expected
> > voltage generated and the voltage input? I am new to this
> 'hobby'.
> >
> > Thanks,
> >
> > Bob in Bellflower.
>
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