JT-34K-DX 

Step-up Transformers

Step-up transformers (SUT) match low-output moving-coil pickups to standard phono preamps. Jensen’s extended frequency response and time accuracy produces legendary sonic transparency while Faraday and double magnetic shields gives them immunity to hum and RF interference. Models available for 3 ohm to 45 ohm pickups.

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Model
Data sheet PDF
Impedance
Ratio
Turns
Ratio
Max Input
@ 20 Hz
THD
@ 20Hz
Freq Response
20Hz/20kHz
Price
USD
4+
Units
12+
Units
 
JT-34K-DX 1:37 ratio, provides 31 dB of gain for low output cartridges. Ideal for many of the Ortofon cartridges Buy Now
1:1369 1:37 -26 dBu 0.125% @ -60dBu -0.37 dB / -0.05 dB $104.76 $95.25 $88.59
JT-44K-DX Provides 20 dB of gain for medium to high output cartridges. Ideal for cartridges such as the Denon DL-103 Buy Now
1:100 1:10 -15 dBu 0.07% @ -50dBu -0.19 dB / -.02 dB $104.76 $95.25 $88.59
JT-346-AXT Provides 11.7 db of gain. Requires additional gain stage added in between this transformer and the phono preamp. Buy Now
1:16 1:4 +2 dBu 0.015% @ -30dBu -0.10 dB / -0.10 dB $228.36 $207.62 $193.13
JT-346-AXT Provides 21.45 dB of gain. *Must have an additional gain stage added in between this transformer and the phono preamp. Buy Now
1:144 1:12 -7 dBu 0.025% @ -40dBu -0.10 dB / -0.10 dB $228.36 $207.62 $193.13
JT-347-AXT 1:8 ratio configuration provides 17.5 dB of gain. Works with a wide range of high impedance, high output cartridges. Buy Now
1:64 1:8 -3 dBu 0.025% @ -40dBu -0.16 dB / -0.20 dB $249.95 $227.25 $211.39
JT-347-AXT 1:12 ratio configuration provides 21 dB of gain. Works with a wide range of medium impedance, medium output cartridges. Buy Now
1:144 1:12 -7.0 dBu 0.025% @ -40dBu -0.16 dB / -0.20 dB $249.95 $227.25 $211.39
JT-347-AXT 1:24 ratio configuration provides 27 dB of gain. Works with a wide range of low impedance, low output cartridges. Buy Now
1:576 1:24 -10 dBu .0.25% @ -40dBu -0.15 dB / -0.18 dB $249.95 $227.25 $211.39
Model # Description Price USD 4+ units 12+ units Impedance Ratio Turns Ratio Max Input @ 20Hz THD @ 20Hz Freq Resp 20Hz / 20kHz
JT-34K-DX 1:37 ratio, provides 31 dB of gain for low output cartridges. Ideal for many of the Ortofon cartridges $104.76 $95.25 $88.59 1:1369 1:37 -26 dBu 0.125% @ -60dBu -0.37 dB / -0.05 dB Buy Now
JT-44K-DX Provides 20 dB of gain for medium to high output cartridges. Ideal for cartridges such as the Denon DL-103 $104.76 $95.25 $88.59 1:100 1:10 -15 dBu 0.07% @ -50dBu -0.19 dB / -.02 dB Buy Now
JT-346-AXT Provides 11.7 db of gain. Requires additional gain stage added in between this transformer and the phono preamp. $228.36 $207.62 $193.13 1:16 1:4 +2 dBu 0.015% @ -30dBu -0.10 dB / -0.10 dB Buy Now
JT-346-AXT Provides 21.45 dB of gain. *Must have an additional gain stage added in between this transformer and the phono preamp. $228.36 $207.62 $193.13 1:144 1:12 -7 dBu 0.025% @ -40dBu -0.10 dB / -0.10 dB Buy Now
JT-347-AXT 1:8 ratio configuration provides 17.5 dB of gain. Works with a wide range of high impedance, high output cartridges. $249.95 $227.25 $211.39 1:64 1:8 -3 dBu 0.025% @ -40dBu -0.16 dB / -0.20 dB Buy Now
JT-347-AXT 1:12 ratio configuration provides 21 dB of gain. Works with a wide range of medium impedance, medium output cartridges. $249.95 $227.25 $211.39 1:144 1:12 -7.0 dBu 0.025% @ -40dBu -0.16 dB / -0.20 dB Buy Now
JT-347-AXT 1:24 ratio configuration provides 27 dB of gain. Works with a wide range of low impedance, low output cartridges. $249.95 $227.25 $211.39 1:576 1:24 -10 dBu .0.25% @ -40dBu -0.15 dB / -0.18 dB Buy Now

 

wire-lead

Wire Lead - Standard wire termination with retainer clamp

 

Notes:
The JT-346-AX is now a 346-AXT to match the 347.
The JT-346-AXT is NOT suitable for a stand alone application. It is designed to be integrated into a moving coil preamp design and requires a 6.8kOhm load. As it will not work properly into a standard 47kOhm phono preamp. 

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