Hi Peter,
Yes, though they are a rare animal indeed, there were a few 120 mA gas discharge ballast transformers out there, and I believe they were available in the typical NST voltage ranges (6, 7.5, 9, 12, and yes 15 kV.) Come to think of it, I can’t recall ever actually seeing one in person myself, just pictures. Don’t know if they even manufacture these type of transformers any more? Seems like IIRC, they were referred to as ‘cold cathode’ transformers. Besides possible bombarder duty in neon sign fabrication shops, these beasts would have probably only seen use in the field in Arctic climates, where subzero ambient temperatures would impede the noble gases from ionizing as readily, thus requiring more startup current. I seem to recall even seeing a 240 mA! NST, (but only 7500 volts) on eBay once. Many neon type signs are beginning to be replaced by LED based signs and the few that still utilize the ionization of rarified noble gases to obtain their luminosity use those small inverter transformers instead of the old iron core style, which are unfortunately useless for coiling.
I would be willing to wager that if you could even find one, it would likely cost you considerably more than a decent 10 or 15 kVA rated pole pig.
Another David
Sent from my iPhone
> On Apr 27, 2018, at 5:00 PM, Peter Komen <flyin.low@xxxxxxxxxxx> wrote:
>
> David,
>
> I have a 30" toroid I was going to advertise on here. 30" x 12" x 9". 30"
> large diameter, 12" inside diameter, and 9" for torus diameter. Anyhow I
> was thinking $400. I'll ship. It is in a double box and almost ready to
> go. If you are interested, I can take some pictures. I bought this in a
> group buy long ago and haven't used it much.
>
> I've never seen a 15kv, 120ma NST.
>
> Pete Komen
>
> -----Original Message-----
> From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David
> Sent: Friday, April 27, 2018 6:21 AM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] WTB - Lg Torid / Lg NST
>
> Hello everyone - Since we seem to be in swap meet mode, I've been
> looking for a couple of items.
> _
> 1) Looking for a 30 inch spun aluminum toroid_ I've been using a 20 inch
> that I got from Ross decades ago but I should be using at least a 30
>
> 2) _Maybe the large 15kv - 120ma NST_, I know those NST's are hard to
> find but if one were to surface at a reasonable price I'd be very
> tempted. I already have one of these bad boys and I've always wanted to
> use two with secondary's in parallel and primary's in series for 240
> volt operation.
>
> Thanks
> David
> Nokesville, Virginia, usa
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