Thordarson transformer info

Bruce-

My memory is quite dim from working with Thordarson transformers many years ago, but I think your analysis of the part number is correct. It doesn't sound like the numbers I remember.

I believe it is a proprietary in-house number supplied by the company it was made for. The best you can do may be to contact the equipment manufacturer and ask them for data. If there is a Sam's Photofact published for the equipment, it might have additional part number cross-reference data.

If you want to make this a learning experience, you could analyze the transformer yourself. Using an audio oscillator at one KHz, apply a voltage to one winding and measure voltage on the other windings. Turns ratio is equal to voltage ratio. For an actual turns count, you might snake several turns of fine enameled wire around the existing windings, and include the known number of turns in your ratio calculations.

For frequency response, load one winding with a resistor and measure input impedance and output voltage as a function of frequency. For power handling, you might insert a current-sampling resistor and observe voltage vs. current on a scope. For your choice of minimum frequency, current will peak considerably when you increase voltage above a critical level, as the core saturates.

Good luck!

Fred

: I believe it is a proprietary in-house number supplied by the company it : was made for. The best you can do may be to contact the equipment : manufacturer and ask them for data. If there is a Sam's Photofact : published for the equipment, it might have additional part number : cross-reference data.

Yeah, you hit it on the head.

Just as a follow up for future archives, there does seem to be a pulse left at Thordarson, one email address I ran across (xformers at aol dot com) was valid and they responded back. Not really sure what they are up to, there was a one-liner that said they moved from Chicago to southern Illinois.

Anyway, they did have the info on the transformer on file, was custom built for the company who made the thing I'm tinkering with, but they can't sell replacements because of that.

They were able to provide some technical info on the specific transformer which between that and a few measurements from the working one should be able to qualify suitable replacements.

-bruce snipped-for-privacy@ripco.com