The Jensen Transformers JT-13K7-A 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.
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-A 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.
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.
Here the JT-13K7-A is shown in the included mounting clamp. The wire leads can also be seen in this photo.
This shows the bottom of the transformer
Shown here are the included items
Here is the JT-13K7-A spec sheet. PDF format.
Design excellence, high quality materials, meticulous workmanship, and superior service...put it all together and you get a superior product. Don't get stuck with bad advice, poor service, slow shipment or an inferior product. If you want the best, here it is.