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Extremely collectable and excellent sound quality. This particular unit belongs to a well known Sydney Amplifier Builder. He's gone through it thoroughly and serviced and adjusted it completely, so its a "plug and enjoy" deal for the new owner.
Cosmetically, its obviously had a very easy life. No major marks or scratches. The walnut side cheeks would clean up beautifully with some oiling to bring out their lustre.
I've listened to this amp on my bookshelf speakers (Reference 3A MM Capo's) and it has some of the most transparent highs and mids I've heard from any vintage solid state amp. Paired with reasonably sensitive speakers, this would be a very enjoyable addition to anyone's vintage audio collection.
I've enclosed some pictures of reviews from the day, plus a more recent opinion from Stereonomono here http://stereonomono.blogspot.com.au/2015/12/jbl-sa-600.html?m=1
Power Output:80 watts continuous RMS power;
40 watts per channel, at any frequency from 10 cps to 30,000 cps
From high level inputs : ±0,75 dB (20 - 20,000 cps); ±1,5 dB (10 - 130,000 cps)
Power amplifier only (measured at test point provided) : ±0,25 dB (20 - 20,000 cps); ±1,5 dB (3 - 200,000 cps)
From High level Inputs : less than 0,2% (20 - 20,000 cps at 80 watts or any level less than 80 watts); less than 0,1% (20 - 20,000 cps at one watt)
Power Amplifier Only : less than 0,15% (20 - 20,000 cps at 80 watts or any level less than 80 watts)
From High level Inputs : less than 0,2% (at 80 watts or any level less than 80 watts);
less than 0,07% (at one watt)
Power Amplifier Only : less than 0,15% (at 80 watts or any level less than 80 watts)
Sensitivity (Signal required for rated output):
Phono Input (at 1,000 cps reference) : 4, 8 or 16 mV into 47 k ?, switch selected
Tape Head Input (at 500 cps reference) : 2 mV into 47 k ?
High Level Input : 0,25 V into 30 k ?
Maximum Phono Signal: 250 mV at 1,000 cps with less than 0,1% harmonic distortion. The highest output magnetic cartridges available will not overload the input stages of the SA-600
Hum and Noise:
Through both preamplifier and power amplifier :
Low level inputs (1 k ? termination) : 72 dB below rated output, equivalent to 1 mV at input terminals or 80 dB below 10 mV.
(These specifications are measured with the phono switch set a t Low, giving rated output with 4 mV signal. With switch set at Med. Or High noise is further reduced to 75 dB or 78 dB below rated output, respectively. )
High level inputs : 85 dB below rated output.
Transient Response: rise time measured at high level inputs is 2,5 ms from 10% to 90% of square wave signal at 160 watts peak power or any lower power level.
Power amplifier only 2,0 ms at 160 watts peak power or any lower power level.
Response to such square wave signals is free from detectable overshoot or ringing, as observed on an oscilloscope.
Overload Recovery: less than 1/10 of one cycle to recover from 100% single cycle overload at any frequency from 20 to 20,000 cps.
Output Impedance: 8 ? rated impedance, 4 to 16 ? nominal impedance.
(when driving a 16 ? load, the SA-600 meets all published specifications except that power output is reduced to 64 watts. Wen driving a 4 ? load the SA-600 produces 130 watts of undistorted power for brief periodes of time. Prolonged operation at more than 40 watts per channel however will trigger the built-in automatic overload devices.
Stability: The SA-600 is completely stable when connected to any loudspeaker system or even to a capactive load, AC line surges do not affect the stability of the circuit.
Short Circuit Protection: Absolute, The SA-600 cannot be damaged by accidental or intentional short or open circuit at the output terminals, or by any degree of impedance mismatch.
Transistors: 36 silicon transistors plus 19 silicon diodes.
Dimensions (W x H x D): 16-3/16" x 5-1/16" x 13-3/4"