Solid State
Amplifier / Preamplifier
Recognized
by all leading test organizations and audio publictions as the finest complete
amplifier available. Absolutely lowest noise. Intrinsic distortion lower than
the residual distortion of the finest test instruments. This award-winning
design features professional quality controls, and the JBL T-Circuit for a
sonically transparent, conservatively rated 40 watts per channel. Built-in
Aural Null system permits perfect stereo balancing.
The SA-600
Amplifier consist of three major functional sections.
These are:
The two-channel preamplifier contained on a single, large circuit board, the
two separate power amplifiers on identical circuit boards, and the power
supply.
Each
preamplifier has five inputs any one of four are selected by the Sellector
Switch. The main output of each preamplifier is coupled to a power amplifier.
An auxiliary preamplifier output is available at the :Out to Recorder
Jack". A separate "Tape Play" input is provided, bypassing the
slector switch and "Out to Recorder" jack.
The two
power amplifier circuit boards ahare a cast heat sink with common power supply.
The channel A power amplifier is on the top and the channel B is underneath.
The power
supply uses silicon diodes and provides +23 volts DC regulated for the
preamplifier and six balanced plus and minus supply levels to the power
amplifiers. The power supply common return is chassis ground.
Special
Features:
Built-in JBL
Aural Null stereo balancing system for simple, exact balancing of stereo
installation.
Three-position
phono switch for best possible signal-to-noise ratio.
Tape monitor
switch for direct comparison of program source with recorded signal while
recording.
Front panel
stereo headphone jack.
Specifications:
(All
specifications are measured with both channels operating simultaneously into 8 Ω loads. AC line voltage is held to 117 volts, 60
cycles. During normal use, the performance of the SA-600 is not appreciably
affected by line voltage fluctuations between 110 and 127 volts.)
Power
Output:
80 watts
continuous RMS power;
40 watts per
channel, at any frequency from 10 cps to 30,000 cps
Frequency
Response:
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)
Harmonic
Distortion:
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)
Intermodulation
Distortion:
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 Ω, switch selected
Tape
Head Input (at 500 cps reference) : 2 mV
into 47 k Ω
High
Level Input : 0,25 V into 30 k Ω
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 Ω 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 Ω rated impedance, 4 to 16 Ω
nominal impedance.
(when
driving a 16 Ω load, the SA-600 meets
all published specifications except that power output is reduced to 64 watts.
Wen driving a 4 Ω 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"