SOLD - FOR SALE: Vintage Nakamichi SR4 " Stasis" Stereo Receiver- 60 watt/ch, MC/MM Phono Input
Item #649367998Info: Vintage Nakamichi SR4 " Stasis" Stereo Receiver- 60 watt/ch, MC/MM Phono Input
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Jul 16, 18 5:52am (PST)
Edited: Aug 07, 18 6:20am
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Nakamichi SR4 Receiver, vintage 1987-1989
Original Retail Price- 1,000.00us
Receiver is in good ++ condition , looks and sounds great !
Please note " Unfortunately, the switch cap for AM selection is missing however the
switch functions properly when pressed as one would normally do anyways.
This is purely a cosmetic issue and will not affect the use and performance of this
fine piece of equipment in any way ! (see the pics) Not sure, if any will use the AM band
Based on the vintage year, I would consider this receiver in very good condition
even taking the missing switch cap into consideration .These are not that easy to find
in the marketplace.
I am sure that there are others that will disagree with my assessment
and that is fine with me, sellers tend to round up and buyers tend to round down ! LOL
Idle current has been checked for stability and re-adjusted to factory spec
of 23mv +/- 1 mv , using a Fluke DVMM
Tuning range: FM, MW
Power output: 60 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.1%
Input sensitivity: 0.16mV (MC), 2.5mV (MM), 200mV (line)
Signal to noise ratio: 73dB (MC), 80dB (MM), 105dB (line)
Output: 200mV (line)
Speaker load impedance: 4Ω (minimum)
Phono Input selection- **** Moving Magnet , Moving Coil****
Tone Defeat Push button
Sub-Sonic Filter Push button
Continuously variable Loudness control
Mute (decrease volume to 1/10th) push button
Pre-Amp / Power Amp jumpers
AM loop antenna included
Dimensions: 430 x 100 x 370mm
Inside, the key component to the SR-4 is the unique Nelson Pass’ STASIS circuitry. Below is the explanation as given in the patent.
“A transistor amplifier in which collector to emitter voltages and currents are kept constant, particularly in the power output stages of the amplifying devices for minimizing distortion due to changes in the transistor beta, the essential form of distortion in amplifiers. High fidelity low power output current from a cascaded transistor amplifier is fed through a load to a second, high power, amplifier having constant current and less than unity gain, with an output summed with the output of the first amplifier such that the output of the first low power amplifier is the signal bearing portion and the output of the second amplifier serves as a current bootstrap, increasing the effective impedance of the load as seen by the first amplifier”
$350.00,pickup in Mississauga, auditions welcomed and recommended !
(NOT interested in Kijiji style low ballers and their offers or previous inquiries that lack the common courtesy of a simple reply )
High Fidelity review here:
(The A signifies that the receiver has met all US UL regulations )
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