Thordarson transformers

shzmm · 14th May 2009, 01:57 PM

Hello,
I am looking for information on some Thordarson transformers. They were part of a very strange piece of equipment built sometime in the 1940's I believe.
At least some of them are audio transformers as that is what they say on the outside!
I have looked on the web but it seems as though most of the catalogs stop around 1941 and the units I have aren't in there.
The numbers are as follows:

T-51751 power transformer 2 115V 60CY(!) primaries 1000V 2MA (mega or milli? it is written in capital letters) 2.5V 2A

T-49437 2 pins possibly a choke?

T-49436 output transformer (written on the case) ratio p/s .485/5.9 on the pin side
(2) S.2, C.T., P, B, 600ohms (possibly a push pull line output transformer?)

T-51449 4 pins and quite small

T-49428-A 6 pins also small

The unit also had an UTC A-26 grid to line output transformer which I found info on relatively easily. I would really appreciate any help finding more information on these pieces, I'm certainly hoping to find something useful out of them!

Thanks for your time

Tom Bavis · 14th May 2009, 02:56 PM

I doubt you'll find anything - they are probably OEM part numbers, not catalog parts. I'd measure ratios with low voltage 50 Hz AC. Impedance ratio is voltage ratio squared.

You can measure inductance if you have an AC milliammeter. Inductance is Volts applied / current (gives reactance) then divided by 2*pi*50 (Hz).

Zibi · 14th May 2009, 09:59 PM

http://www.bunkerofdoom.com/xfm/index.html

shzmm · 15th May 2009, 08:21 AM

Thank you both for your replies. I saw the bunker of doom site before but didn't find the information. I think Mr. Bavis might be right that they are OEM numbers. Although the unit was definitely a one off piece.
I suppose I will have to do some calculations then...

14th May 2009, 01:57 PM	#1
shzmm diyAudio Member Join Date: Jul 2008	Thordarson transformers Hello, I am looking for information on some Thordarson transformers. They were part of a very strange piece of equipment built sometime in the 1940's I believe. At least some of them are audio transformers as that is what they say on the outside! I have looked on the web but it seems as though most of the catalogs stop around 1941 and the units I have aren't in there. The numbers are as follows: T-51751 power transformer 2 115V 60CY(!) primaries 1000V 2MA (mega or milli? it is written in capital letters) 2.5V 2A T-49437 2 pins possibly a choke? T-49436 output transformer (written on the case) ratio p/s .485/5.9 on the pin side (2) S.2, C.T., P, B, 600ohms (possibly a push pull line output transformer?) T-51449 4 pins and quite small T-49428-A 6 pins also small The unit also had an UTC A-26 grid to line output transformer which I found info on relatively easily. I would really appreciate any help finding more information on these pieces, I'm certainly hoping to find something useful out of them! Thanks for your time

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14th May 2009, 02:56 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	I doubt you'll find anything - they are probably OEM part numbers, not catalog parts. I'd measure ratios with low voltage 50 Hz AC. Impedance ratio is voltage ratio squared. You can measure inductance if you have an AC milliammeter. Inductance is Volts applied / current (gives reactance) then divided by 2pi50 (Hz).

14th May 2009, 09:59 PM	#3
Zibi diyAudio Member Join Date: Jan 2006 Location: Bialystok	http://www.bunkerofdoom.com/xfm/index.html

15th May 2009, 08:21 AM	#4
shzmm diyAudio Member Join Date: Jul 2008	Thank you both for your replies. I saw the bunker of doom site before but didn't find the information. I think Mr. Bavis might be right that they are OEM numbers. Although the unit was definitely a one off piece. I suppose I will have to do some calculations then...

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