What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Akai GX-255 (1978)

Akai Stereo Tape Deck with Auto-Reverse Playback in Stereo
Compact, attractively designed 4-track, 2-channel stereo tape deck for those who are satisfied with nothing less than fully professional sounding stereo recordings. Features auto-revers playback, Akai's exclusive GX Head for peak sound fidelity and light pressure IC logic control buttons.

Track System:  4 track 2 channel stereo/monaural system
Reel Capacity:  Up to 7 inch reel
Tape Speed: 
19 cm/s ±0,8% (7½ ips.) 
9.5 cm/s ±1% (3¾ ips.)
Wow & Flutter:
at 19 cm/s :  Less than 0,04% WRMS; (0,10% DIN 45500)  
at 9.5 cm/s :  Less than 0,06% WRMS; (0,12% DIN 45500)
Frequency Response: 
at 19 cm/s (WR tape) :  30 - 24,000 Hz ±3 dB  
at 9.5 cm/s (WR tape) :  30 - 19,000 Hz ±3 dB
Distortion:  Less than 0,5% (at 1,000 Hz 0 VU)
Signal to Noise Ratio:  Better than 61 dB DIN 45500 at 19 cm/s
Erase Ratio:  Better than 70 dB (at 1,000 Hz)
Cross Talk:  Better than 40 dB (at 1,000 Hz)
Channel Separation:  Better than 55 dB (at 1,000 Hz)
Bias Frequency:  100 kHz
Heads:  4 (GX recording head; GX forward playback head; GX reverse playback head and erase head)
Motors:  3 (One A.C. servo motor for capstan drive; Two Eddy Current motors for reel drive)
FF. and RWD. Time:  75 sec. using 360m (1,200 ft.) Tape
Output Jacks: 
Two Line :  0.775V (0 VU) Required load impedance: more than 20 kΩ 
One Phone :  100 mV/8Ω
Input Jacks: 
Two Microphone :  0.25 mV Required microphone impedance: 600 Ω
Two Line :  70 mV Input impedance 100 kΩ
DIN Jack: 
Input :  2.0 mV Input impedance 10 kΩ Output; 0.3 V
Power Requirement: 
120V 60 Hz for U.S.A. & Canada 
220/240V, 50/60 Hz switchable for Europe, UK & Australia 
110/120/220/240V,50/60 Hz switchable for the other countries
Dimensions (W x H x D):  440 x 419 x 242 mm (17,3" x 16,5" x 9,5")
Weight:  16 kg (35,3 lbs.)

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