A
perfectionist's instrument, featuring unparalleled flexibility of inputs,
outputs, mixing, and professional linear actuated controls, the Graphic
Controller offers the flatest frequency response, lowest distortion, lowest
noise level and greatest operating convenience of any preamplifier. Additional
controls, tape monitor switch and convenience inputs and outputs are located
behind special hinged front panel.
Special
Features:
Professional
linear-actuated controls allow precise adjustment and give instant visual
recognition of exact settings. Illuminated push-buttons permit instantaneous
switching from any function to any other function. Seledom-used controls are
concealed behind a hinged lower panel, out of sight when not needed, yet
directly accessible from the front.
Included in
the secondary control bank are output level set controls, gain controls for
both phono inputs, high frequency filter, low frequency filter, tape monitor
witch, and an auxiliary "trim" balance control for the phono input.
(Whit this, the residual unbalance in any particular pickup cartridge can be
eliminated without disturbing normal settings for other program material) the
hinged panel also conceals input and output jacks for convenient connection of
temporary auxiliary equipment.
Aural Null
Stereo Balancing System
By adding
the F22 remote relay (available as an accessory), the Graphic Controller
becomes more than a fine stereo control center , it can be used as a sensitive instrument for
balancing channels and checking the performance of your stereo component
installation.
Specifications:
(All
specifications are measured with AC line voltage of 117 volts at 60 cycles.
Line voltage fluctuations between 105 and 127 volts do not affect the
performance at the Graphic Controller.)
Output: 3 Volts (more than sufficient to drive a JBL
Energizer or any conventional power amplifier)
Frequency
Response: Typical response is within ¼ dB through the entire audible range from 20 -
20,000 cps. (the smallest deviation which can be detected by the human ear is
approximately one dB.)
Distortion
(these are typical specifications under ambient temperatures which would
normally be encountered in a home installation):
Total
Harmonic Distortion (at full rated
output): less than 0,15% at any
frequency from 20 - 20,000 cps
Intermodulation
Distortion: less than 0,05% at 3 volts
output
Hum and
Noise: 1 mV or less referred to the low
level phono input. From high level inputs, noise is 90 dB below rated output.
Gain:
Low level
inputs: 54 dB
High level
inputs: 2 dB (require 0,3 volts for
rated output)
Tone
Controls:
Treble
: 17 dB boost or cut at 20,000 cps
Bass : 21 dB boost or cut at 20 cps
Control
Tracking Accuracy:
Through
their full range of operation, the linear actuated controls of the Sg-520
exhibit variations typically less than one decibel from laboratory
specifications. This means that you enjoy the unlimited flexibility of
continuously variable controls, yet with a degree of tracking accuracy normally
obtainable only with individual calibrated switch-type attenuators.
Tempearature
Stability:
The SG-520
is considerably less sensitive to temperature changes than ordinary
transistorized preamplifiers. So long as sufficient ventilation is provided to
keep air temperature in its immediate vicinity below 110° F, it can be left on
indefinitely without affecting the quoted specifiactions.
Dimensions
(W x H x D): 15-9/16" x 6-1/2"
x 13"