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Radial Introduces Jensen Twin-Servo 500 Series Preamplifier

Faithfully reproduced following Deane Jensen's "original recipe" and adapted to fit the 500 series format

Radial Engineering has announced the new Jensen Twin-Servo 500 series preamplifier, a remake of a renowned, popular preamp of the past.

According to Jensen chief technology officer Bill Whitlock, “When Deane Jensen first put his mind towards building the finest microphone amplifier possible, the development process began with the now famous 990 op-amp. Part of the magic was maximizing the gain-margin so that no matter what the input, the lowest possible distortion would be realized.

“The unique design essentially cruises along in Class-A mode and then transitions to Class- AB only when pushed to extremes. In order to eliminate phase shift, all capacitors were removed from the signal path and replaced with servos. The ‘unlimited bandwidth’ enables the design to reproduce signals from DC to light. He then added two of Jensen’s most robust transformers to the sauce in order to eliminate DC coupling noise and provide the necessary drive for long cables.

“The end design incorporates two 990 op-amps cascaded in series, two servos and two Jensen transformers, thus culminating in the Twin-Servo name. One listen and you will immediately hear a bottom end response like no other with a smooth, natural rendering that extends from 0.2 Hz to 150 kHz. Working with the Radial design team, the Jensen Twin-Servo 500 has been faithfully reproduced following Deane’s original recipe and been adapted to fit the 500 series format.”

This 500 series version is able to deliver up to 60 dB of gain. It includes a front-panel Neutrik Combo connector with choice of XLR and 1/4-inch inputs, a dual-gang potentiometer for level adjustment along with a 10 segment LED meter for viewing.

This is supplemented with a 180-degree polarity reverse switch that toggles the absolute phase, a gentle high-pass filter to eliminate excessive resonance, a -10 dB pad, and a 48-volt phantom power activation switch.

The 100 percent discrete design follows Radial’s standards with all-steel construction, rugged powder-coat finish, a fully enclosed back box and dual-sided gold contacts for positive connection to the 500 series back plane.

The Jensen Twin-Servo will be available in March 2016 and carries a MAP price of $999.99 USD.

Radial Engineering

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