Jensen JE-346-AX MC step up transformers - diyAudio
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Old 27th March 2011, 01:37 PM   #1
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Join Date: Sep 2004
Location: MN
Default Jensen JE-346-AX MC step up transformers

Pair of Jensen JE-346-AX Moving Coil step up transformers. there is published info on the web that these are also used as ribbon mic step up transformers.

apparently these are some of the best MC step ups available. and look at the freq response of these bad boys!
JT-346-AX can be wired for either 1:4 or 1:12 step up ratio.

Bandwidth -3dB, 1:4: 0.3Hz 220kHz
Bandwidth -3dB, 1:12: 0.3Hz 200kHz
Deviation from linear phase, 1:12: +1.0 degrees typical
Noise figure, 1:12: 1.4dB at 5Ohms
Common mode rejection, 1:12: 145dB at 60Hz
Fully balanced primary
Primary may be reversed for polarity inversion
Double magnetic shield

apparently this MC step up is unobtanium now. Jensen only makes JT-347-AX which sell for US $250 each. JT-347-AX frequency band is only half of of the 346 transformers (0.4Hz 100kHz) and common mode rejection is 20dB (10x) worse than that of the 346 from what i have read. But this info is quite old and may not be very accurate anymore. I have also read that Jensen may still make a 346 but a 346-AXT version

Looking for serious offers.

Info from Jensen on 1:4 ratio

Info on 1:12 ratio
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Old 2nd February 2017, 08:10 AM   #2
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Join Date: May 2010
Location: Chicago IL, Long Beach CA, Vienna VA
This is an old thread, did you sell them? I'm looking at buying a pair of JT-346-AXT which list for $228 each but that's a LOT of money!
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