Can you identify this transformer? 70V line matching? - diyAudio
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Old 17th April 2013, 08:19 PM   #1
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Location: Harrisburg, PA 17111
Default Can you identify this transformer? 70V line matching?

I wonder if someone can help me identify what type transformer this is. I have two of them- one is ink stamped 12X6Z and the other 24Y6Z. Google hasn't helped. They seem/measure almost identical.

Using the DMM, I can tell that the black is the CT for the brown leads (.3 ohms between brown leads). Because the other leads are not color coded in pairs, I'm wondering if these are 70V line matching transformers, but not sure how to confirm.

Just guessing, I use the green as common and get these measurements. The voltage is the result of inputting 1VAC @ 400Hz into those leads and measuring at the brown leads:

green-to-white: 15.6 ohms, .14VAC, turns ratio= 7.14
green-to-blue: 17.5 ohms, .125VAC, turns ratio= 8
green-to-yellow: 44.8 ohms, .074VAC, turns ratio= 13.5
green-to-red: 50.4 ohms, .068VAC, turns ratio= 14.7

Those ratios don't ring a bell, so maybe I'm using the wrong common? Using the red as common gives slightly different figures, but nothing recognizable (to me).

Here's a photo:

Click the image to open in full size.

Weighs about 2.5pounds, core measures approx 2.5"w x 1.25" deep x 2.2" tall. 5 watts?

Is there a standard color code for these type transformers?
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Keith Ostertag, Harrisburg PA, Crown amps, Dahlquist DQ-18 speakers, custom NHT1259 subwoofers, Marchand XO, DT880 headphones
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Old 17th April 2013, 09:26 PM   #2
DF96 is offline DF96  England
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The split-bobbin construction implies good voltage isolation between primary and secondary, with acceptance of the resultant weaker coupling. That suggests power supply rather than signal.

Could the multi-coloured winding be a mains primary? Perhaps 0-110-120-200-220V? Green is 0, red is 220?
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Old 17th April 2013, 11:16 PM   #3
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Oh, OK, thanks very much!

Since I never use 220 it didn't occur to me to think of it that way.
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Old 18th April 2013, 11:31 AM   #4
DF96 is offline DF96  England
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Don't take my word for it. Try it via a lamp limiter. Do not directly connect the primary to the mains supply unless you are sure this is safe.
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