Big heavy Siga toroid...any ideas or use?

[multi-volti]

I have this huge toroidal power transformer made by Siga in the UK. I e-mailed the part number and got a letter back with specs.

I never know what to make of power transformer specs...sometimes they list ac voltage but DC current, and if they give a VA/kVA rating , I assume it is for the line/mains side, ignoring any inefficiency/losses.

With those biases to my thinking, if I multiply the voltage and current rating for each secondary and add them up, I have some kind of sum of VA products for the secondary. They add up to about 1.8 kVA.

Anyone know if this logic makes sense, or if there are other factors based on rectifier type, filter type, etc.

I've attached a scan of the letter I got back.

It's got to be a about 12"/30 cm diameter and 4"/10 cm height.

It's got so many windings I can't really think of a single amplifier kind of application...but you hate to call something like this useless. I don't remember what it weighs, but the more I think about it the less practical it seems...

Any reflection on interpreting the data would be appreciated...

Thanks

Murray

[dave_gerecke]

Damn! That is a beefy xfmr! From a quick read of the specs sent, and doing a bit of calculation, you could use the 32.1 volt windings to make a power amp that would do 200-250w per channel without trouble. Of course that would require the amp design, and an incoming AC circuit to handle that monster. And looking at the other windings, the 35.4v rails might work for the VAS stage in the amp. The 18-0-18v winding would be useful for the supply to a regulator to supply voltage to op amps. Not sure about the other secondaries, perhaps use for control voltages?

Peace,

Dave

[geraldfryjr]

MAN, I sure would like that one in my arsenal as well!
A couple of class a amps comes to mind. jer

[multi-volti]

Jer-

I sent you an email thru the DIYaudio console...

[multi-volti]

email back from a helpful SIGA person. The V & I 'specs' in the letter are ac rms values, 1850 VA conservative commercial continuous rating.