Nakamichi SR-3A
Little is documented about the Nakamichi SR-3A. The record shows an AM/FM receiver that Nakamichi positioned as a "separates-like" component - built to sound like a separate tuner, preamp, and power amp in a single chassis. HiFi/Stereo (December 1986, p.61) tested the SR-3A. It noted a video monitor pass-through (which lets the selected source be routed to a monitor), a bass and treble tone-control bypass button, and switchable preamplifier inputs. The same issue's test report (p.66) measured the amplifier section's sensitivity at 29 mV for 1 watt output (CD input). Frequency response was flat within +0.2, -0.3 dB from 30 Hz to 15 kHz. Stereo channel separation was 44-46 dB across the midrange, dropping to 37.5 dB at 30 Hz and 40 dB.
The receiver used Nakamichi's proprietary STASIS power amplifier circuitry, borrowed from the PA-7 and PA-5 separates, along with an Isolated-Ground Power Supply. The company's advertising claimed both features prevented interstage coupling and produced an unusually wide, clean soundstage. Known specifications from the HiFi/Stereo review include:
- AM/FM receiver, with video monitor switching
- Power amplifier: STASIS topology
- CD input sensitivity: 29 mV for 1 W output
- Frequency response (line): +0.2, –0.3 dB, 30 Hz–15 kHz
- Stereo separation: 44–46 dB (100 Hz–10 kHz)
- Tone controls: bass/treble with bypass button
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