Hmm, what the heck am I gonna do with this??

[mpmarino]

Hmm, what the heck am I gonna do with this??

Primary: 2 X 100v / 2 X 20v

sec. : 2 X 120v / 2 X 2500VA

50/60HZ

Can you say "inrush"?

[richie00boy]

Are you sure you have the primary and secondary the right way round there?

[mpmarino]

The only way I will be sure is to test it. The label from Toroid Corp. of Maryland states exactly what I typed, however. This is definitely a custom job and I suppose it's possible the label is typo'd. I understand they were for some type of military radar assy.

There is another one like it where I got this, as well as a 2 X 2000va at the same voltages.

[classd4sure]

I don't know about that 2X20 primary...????

Otherwise... sounds like it might make an OK isolation transformer?

[FastEddy]

120 primary / 50 center 50 secondary for 400+ Watts ...

Got sources?

[Stuart Easson]

...For an international piece of equipment...

With the correct parallel/series combination of the 100,100,20,20 you can fulfill just about any nations voltage requirement (100, 120, 200, 220, 240).

Does this weigh like 25lbs? it's possible it really is a 2x2500va xformer, the thickness of the copper visible through the tapes suggest it has huge current rating, you could do a little surgery and center tap the 120v secondaries and get 60+60, 60+60 at some 20amps if it is a 5kw transformer...or just use it as 120+120 for a mighty powerful amp.

Looks like a pretty darn cool find...if a little large for some applications...

Stuart

[mpmarino]

That's a good point about the primaries stuart.

BTW. It weighs in at 79 pounds even.

[AndrewT]

Hi,
Stuart is spot on

any nations voltage requirement (100, 120, 200, 220, 240)

Four 60Vac windings would be handy. Pity about the filled centre though.
You should still be able to test probe for the centre tap and make good any enamel damage before re-wrapping the outer insulation and all this without removing the core.

Would it be a waste to use as an isolating transformer 120 to 120 at a total of 5kVA?

[Stuart Easson]

...the centre is possible...

I bought a set of toroidal transformers from parts express last year, I wanted to rewind them and had the potted centre issue. After slitting the tape around the circumference of the transformer, you can use a piece of broom handle and a hammer to drive it from the centre of the transformer. The insulating tape has a low enough coefficient of friction it simply pops out...

Of course you need more tape to rewrap the thing after you rewind it...

Good luck

Stuart

[SY]

This would be very interesting as a power tranny for an OTL. Figure you'll get +/-170V or so, perfect for an array of 6528.

With a doubler, you could get 500V easy and build one whale of a big conventional tube amp.