Nakamichi SR-2A Stasis AM/FM Stereo Receiver Specificationsby Ron Roberts
The amplifier manufacturer Nakamichi licensed its circuitry technology from the well-regarded amplifier manufacturer Threshold, which was a class A amplifier circuitry labeled "Stasis" by designer Nelson Pass. This specialized amplifier circuitry was used in a line of expensive Nakamichi SR and TA series of stereo receivers, as well as in the Nakamichi PA series of power-amplifiers such as the PA-5 and PA-7.
Nakamich 2 Series
The Nakamichi SR-2 was introduced in 1986. It was one of the Japan-made Nakamichi SR Series that included the 2A, 2E and Taiwanese-built TA models as well. All of these receivers were solid state design that was further distinguished by their amplification circuits. The TA series also featured higher power specs than their companion SR-2, 2A and 2E counterparts.
Nelson Pass is a renown consumer electronics designer who was with Threshold when he designed the Stasis amp circuit. In the Nakamichi SR-2A, each power stage works separately, which means each is individually optimized, individually powered and sonically isolated for minimum interference. Stasis power amplification produces outstanding clean power, uniform impedance, inherent stability and tremendous current capability.
There are two Stasis power amps in the Nakamichi SR-2A that output 35 watts per channel, Class-A power. These are individually isolated as noted above so that the effect was of two mono amps each powering a single channel. It is the Stasis amps that are the basis for the raves attending the SR-2A (and 3A and 4A) Nakamichi receivers to this day.
The 1980s SR-series SR-2A featured all the popular connections and tonal adjustments of the time. It had a tuner with10-station presets and an AM/FM stereo receiver with signal strength meter. In addition, it had RCA inputs for turntable, external tuner, auxiliary line level input and a tape recorder, either reel-to-reel or cassette. The inputs were selectable by a rotary knob on the front panel.
- Hawthorne Stereo: Nakamichi Receivers
- Nakamichi SR2, 2A, 2E Service Manual