Audio Database

Image of SG-77
Commentary

Graphic equalizer equipped with auto-fader mechanism.

Equipped with an auto-fader, you can freely control mixer techniques such as fade-in and fade-out, which are used by professional mixers.
Two patterns, Low and High, can be selected as the timing for crossing the source.
In addition, there is also a FAST switch that can be crossed in a short period of time so that it can be used in both low and high positions.
(The FAST switch is a non-locking type, so you must press and hold it until the operation is complete.)

The graphic equalizer section is divided into 17 sections in 2/3 octave steps from 16 Hz to 25 kHz.
± 12 db and ± 6 db equalization variable range selector, equalizer ON/PASS switches for both source and tape systems, lineout selector for output monitoring, and other useful functions for sound field correction.
It is also equipped with a characteristic inversion function that allows you to apply the inverse characteristics of the equalizer that you set with the touch of a button. This function allows you to correct the frequency characteristics of the player's cartridge and cut tape hiss.

A newly developed equalizer circuit consisting of two stages of amplifiers and four transistors per element is used.
A high-performance IC is used for the amplifier and an ultra-low-noise transistor is used for each transistor to realize a low distortion factor.
Buffer amplifiers are placed in place and volume switches are inserted into low impedance circuits to maintain low crosstalk.

Model Rating
Type Graphic equalizer with auto-fader function
Graphic Equalizer Section
Harmonic distortion factor 0.001% (20 Hz to 20 kHz, 1 V output, equalizer flat
Audio Spectrum Analyzer Measurement)
Input impedance Input, Tape1Play, Tape2Play : 47k Ω
Output impedance Output : 200 Ω
Tape1Rec, Tape2Rec : 2.2k Ω
Frequency characteristic 10 Hz ~ 100 kHz + 0 -2dB (Equalizer Flat)
Signal-to-noise ratio 120 dB (IHF, A network, short circuit
Output 2 v conversion value when equalizer is flat)
Equalizer frequency 16 Hz, 25 Hz, 40 Hz, 63 Hz, 100 Hz, 160 Hz, 250 Hz, 400 Hz, 630 Hz
1 kHz, 1.6 kHz, 2.5 kHz, 4 kHz, 6.3 kHz, 10 kHz, 16 kHz, 25 kHz
(Left and right separated into 17 parts)
Variable range ± 12 dB, ± 6 dB
Gain 0 db (equalizer flat, input 0 db)
<Auto-fader section>
Fade-in time 4 seconds
Fade-out time 6 seconds
<General>
Power supply voltage 100 VAC, 50Hz/60Hz
AC outlet Power switch not linked, 100W
Power consumption 34W (Electrical Appliance and Material Control Law)
External dimensions Width 420x Height 131x Depth 351 mm
Weight 6.9kg