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SECTION 2 SPECIFICATIONS AND PERFORMANCE
2.1 General Specifications
General Protection:
Protection circuitry limits the
output level to protect the output transistor stage, even
in the case of elevated temperature. Transformer
overheating results in shutdown of that particular
channel. Controlled slewing-rate voltage amplifiers
protect the unit against RF burnouts. Input overload
protection is furnished by a resistor at the amplifier
input to limit current.
DC Output Offset:
(Shorted input) +/-10 millivolts.
Hum and Noise:
2.2-volt sensitivity: 110 dFJ below
rated output (A-weighted); 105 d B below rated output
( 2 0 H z - 2 0 k H z ) ; 0.775-volt sensitivity: 105 d B below
rated output (A-weighted).
Phase Response:
+ / - 1 0 degrees 1 0 H z - 2 0 k H z at 1
watt.
Input Impedance:
Nominally 2 0 K ohms, balanced.
Nominally 10K ohms, unbalanced.
High Voltage Power Supply:
Two 900 VA transformers
with computer-grade capacitors.
Low Voltage Power Supply:
+/-15V DC supplies are
provided by a fanformer (an added winding on the fan
motor), regulated by three terminal regulators.
Power Requirements:
60Hz, 120V AC. Draws 60 watts
or less on idle, 1100 W at 250 W/channel output into 8
ohms.
Turn On:
No dangerous transients.
Front Panel Control:
Two-position ON/OFF rocker
switch.
Rear Panel Controls:
Channel 1 and Channel 2 input
level controls. Parallel-mono pushbutton switch.
Display:
Amber LED pilot light driven by low-voltage
power supply. Two amber LEDs to indicate the status
of the high-voltage supplies: thermal shutdown or
blown line fuse.
Connectors:
Inputs - balanced 1/4" phone jacks.
Outputs - color-coded dual binding posts on standard
3 / 4 " centers; spaced 3 / 4 " apart for bridge mono
(balanced) output connection.
AC Line - Two-wire, 20 A, 120 V male connector with 5
ft. cable.
Dimensions:
19" standard rack mount (EIA Std. RS-
3 1 0 - B ) , 3 1/2" height, 1 6 " behind mounting surface.
Center of gravity is 6 " behind the front panel.
Weight:
38 pounds (17.24Kg) net weight.
Finish:
Black splatter-coat steel chassis.
Construction:
Steel chassis, specially designed "flow-
through" ventilation from front to side panels.
Heat Sinking:
Forced-air cooling through internal heat
spreaders.
2.2 Stereo Specifications
Output Power (2 o h m s ) :
5 0 0 w a t t s c o n t i n u o u s
average power per channel at 1kHz into 2 ohms with
no more than 0.25% THD
Output Power (4 o h m s ) :
4 0 0 w a t t s c o n t i n u o u s
average power per channel at 1kHz into 4 ohms with
no more than 0 . 2 5 % THD. 3 5 0 watts + / - 1 d B per
channel, 20Hz - 20kHz into 4 ohms with no more than
1 % THD (EIA Std. SE-101-A).
Output Power.
280 watts continuous average power
per channel at 1kHz into 8 ohms with no more than
0 . 2 5 % T H D . 2 5 0 w a t t s + / - 1 d B p e r c h a n n e l
continuous average power (both channels operating-
into an 8 ohm load, 20Hz - 20kHz at a rated RMS sum
total harmonic distortion of 0 . 1 % of the fundamental
output voltage (tested per FTC specifications). 2 6 5
watts +/-1 d B per channel, 20Hz - 20kHz into 8 ohms
with no more than 1.0% THD (EIA Std. SE-101-A).
Frequency Response:
+/-0.1 d B 20Hz - 20kHz at 1
watt into 8 ohms.
Harmonic Distortion:
Less than 0 . 0 5 % from 2 0 H z -
1kHz and i n c r e a s i n g linearly to 0 . 1 % at 2 0 k H z
delivering 250 watts into 8 ohms, per channel.
IM Distortion:
Less than 0 . 0 5 % from 2 5 milliwatts to
250 watts into 8 ohms, per channel.
Slew Rate:
Greater than 13 volts per microsecond.
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