A pair of Jensen JT-346-AX MC step up transformers for sale. These are some of the best MC step ups available. Jensen is the best known US professional audio transformer manufacturer. JT-346-AX can be wired for either 1:4 or 1:12 step up ratio. It will work with 15 – 45Ohm cartridges in 1:4 ratio and with 1 – 5 Ohm cartridges in 1:12 ratio. It was originally designed for very expensive audiophile commercial phono stage. Its specifications are very impressive: 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 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 my transformers (0.4Hz – 100kHz) and common mode rejection is 20dB (10x) worse than that of my transformers. For the listed price the transformers come without an enclosre and connectors. For extra $50 I can mount them onto a die cast black enclosure with Cardas female RCA connectors. Shipping and Paypal fees extra.
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