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