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Does anyone recognize this transformer?

xbart

xbart

Super Member
No markings on it at all, was brand new packed in original sealed plastic.
I'm guessing it is a output transformer, small at about 3"x3"x2"
This was from an estate sale with quite a few tube goodies. Looks Asian maybe Tamura?
I know it is not a lot to go by, any ideas?
-Brad
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The pins are distinctive, perhaps they will look familiar to someone. Could be input transformer, interstage, a few different possibilities.
 
Lavane said:
It could be a mic transformer also.
Click to expand...
I didn't think of that possibility, all of the mic transformers I have come across were smaller and round.
There even a few at the sale that I picked up that were marked and ID'd.

-Brad
 
I had some UTC mic transformers that were rectangular with rounded corners.
I used them at the I put of a single stage preamp using one 6J5 per channel. Mine were like 2"×2" and 3" or more high.
 
Do you have an ohmmeter? LCR meter? First step is to measure windings for resistance, see what's connected to what. Has enough pins for UL push-pull to 4/8/16 Ohms. Next step is to measure the voltage ratio in/out - 60 Hz is fine. Inductance measurement of primary with secondary open and shorted will give an indication of frequency response.
 
Tom Bavis said:
Do you have an ohmmeter? LCR meter? First step is to measure windings for resistance, see what's connected to what. Has enough pins for UL push-pull to 4/8/16 Ohms. Next step is to measure the voltage ratio in/out - 60 Hz is fine. Inductance measurement of primary with secondary open and shorted will give an indication of frequency response.
Click to expand...
Tom,
I don't plan to use this, maybe offer it up to someone that could. I went ahead and measured resistance. When I have time I'll see about other testing.
Taps 1/2 = 900 Ohms, Taps 3/4 = 32 Ohms, Taps 5/6 = 137 Ohms and Taps 7/8 = 137 Ohms.
-Brad
 
Won't be an output transformer with those values. Perhaps single-ended to balanced line with a feedback winding
 
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