‘Direct Box’ Transformer Selector Guide

These high-ratio step-down transformers (line-level in, mic-level out) deliver extended low-frequency and Bessel-tailored high-frequency responses, resulting in ultra-low time-domain distortion (DLP). They also use Jensen-pioneered multiple Faraday shields for unmatched immunity to hum, buzz, and RF interference. These noise problems can plague systems where guitars and stage instruments (keyboards, samplers, computer, and drum machines) are far from the mixer and abnormally high ground-voltage-differences are the norm. The carefully-controlled high-frequency response removes ultra-sonic “hard digital edge” from signals, resulting in a sonic clarity that has made them famous around the world. Each transformer is enclosed in a MuMETAL® magnetic shielding can to reduce hum caused by any nearby magnetic fields.

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Standard Wide Bandwidth Line Input Transformers

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-DB-E JT-DB-EPC Direct Box transformer, 12:1 step-down ratio, with dual Faraday shields, converts unbalanced line level to balanced mic level ouput. Request
200k:1.5k 12:1 +22 dBu 0.036% -0.08 dB / -0.07 dB $73.08 $66.44 $61.80
Model # Description Price USD 4+ units 12+ units Impedance Ratio Turns Ratio Max Input @ 20Hz THD @ 20Hz Freq Resp 20Hz / 20kHz
JT-DB-E JT-DB-EPC Direct Box transformer, 12:1 step-down ratio, with dual Faraday shields, converts unbalanced line level to balanced mic level ouput. $73.08 $66.44 $61.80 200k:1.5k 12:1 +22 dBu 0.036% -0.08 dB / -0.07 dB Request

 Double Faraday shields and a 30 dB magnetic shield can are standard.

Transformer Styles

wire-lead

Wire Lead – Standard wire termination with retainer clamp

pcb-mount

PC Mount – For direct soldering to printed circuit boards

threaded-bushing

Bushing – Mounts using threaded 3/8″ bushing with nut

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