Measurements of UTC A-21 transformers

[usekgb]

I just found 3 UTC A-21 Transformers.  The seller only wanted $5 a piece for them, so I naturally bought them.  After searching through here, I couldn't find detailed specs for the A-21, so I took some basic measurements.  I measured all three transformers, and took the average to get the numbers I am posting here:

UTC A-21:

Stated on Transformer:
Primary:          Secondary:
1-2:  200R      4-5:  200R
1-3:  500R      4-6:  500R
2-3:  50R        5-6:  50R


Measured DC Resistance:
Primary:          Secondary:
1-2:  19.0R      4-5:  27.3R
1-3:  30.4R      4-6:  43.3R
2-3:  12.0R      5-6:  16.6R


Measured Inductance:
Primary:          Secondary:
1-2:  5.62H      4-5:  5.64H
1-3:  14.20H    4-6:  14.21H
2-3:  1.52H      5-6:  1.52H


I really don't have a good way to measure impedance curves, and they vary with load anyway, so I didn't do them.  I hope this helps.

Now, what to do with these buggers.  I would guess that they could be used as an output transformer for something or other, but I don't have anything solid in mind.  Anyone have some good suggestions?  I'm always up for adding more things to my to-do list. ;D

Cheers,
Zach

 

[emrr]

Cool. There is an inductance thread with lots of transformer measurements you might want to double post in. 

 

[usekgb]

I think I found the right thread.  Started by Ian?  I posted this there as well.