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Jensen Transformers JT-13K7-ATB

1:5 Microphone Input Step-Up Transformer Threaded Bushing Mount with Wire Leads

Made in the USA
Jensen Transformers JT-13K7-ATB 1:5 Microphone Step-Up Transformer w/Threaded Bushing style mount

Jensen Transformers JT-13K7-ATB 1:5 Microphone Step-Up Transforme

The Jensen Transformers
JT-13K7-ATB is a microphone input transformer with a 1:5 step-up ratio, making it ideal for medium impedance amplifiers.

Microphone preamp designs incorporating Jensen Input Transformers offer several
advantages over the more commonly used, inexpensive "transformerless" designs:

1) Superior Common Mode Interference Rejection

2) Superior Radio Frequency Interference Rejection

3) Ideal impedance matching of source to amplifier

4) Elimination of input coupling capacitor distortion

Jensen manufactures Microphone Input Transformers in many step-up ratios in order to provide the best possible noise performance with any type of active amplifier device.

In addition to the 3/8" Threaded Bushing Mount shown here, Jensen Transformers also offers a clamp-only style mount.  Please click here to see that model.

With inferior products coming from all over the world, we think it is a genuine treasure to find a company like Jensen Transformers, actually designing and manufacturing some of the finest products in the world, right here in the USA, and we are proud to be able to offer their products. The JT-13K7-ATB is made in the USA, is backed by the manufacturer's comprehensive one-year warranty, and has a remarkable 20-year warranty on the transformer device itself.

Jensen Transformers' Description

Jensen Transformers JT-13K7-ATB



  • Our best input transformer for most popular IC amplifiers
  • wide bandwidth: -3 dB at 0.9 Hz and 120 kHz
  • 13.8 dB voltage gain with transformer Noise Figure of only 1.0 dB
  • Input impedance of 1.5 kΩ for loading loss under 0.9 dB
  • High common-mode rejection: 119 dB at 60 Hz

With its 4.1 kΩ secondary source impedance, this transformer not only optimizes noise performance of many IC or discrete amplifiers but also offers excellent CMRR as well. The primary is fully balanced and its leads may be reversed to invert polarity, if required. A 30 dB magnetic shield package is standard.

Jensen Transformers JT-13K7-ATB Threaded Bushing

Here is the JT-13K7-ATB spec sheet.  PDF format.

Jensen Transformers JT-13K7-ATB, included items

Shown here are the included items

Jensen Transformers JT-13K7-A Data Sheet - click to download PDF

Here is the spec sheet for the electrically identical standard model.  PDF format.

Purchase Information
Product Description SKU MSRP Your Price Quantity
Jensen Transformers 1:5 Microphone Step-Up Transformer, Threaded Bushing style mount
This model is available by special order only, and only in quantities greater than 10.  Last lead time quoted by the factory was 16 weeks,
JT-13K7-ATB $119.95 $101.85
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