Akai GX-635D reel-to-reel

Making It An Even Better System: A new GX head

A system that uses a head for each function as that of the GX-635D does would not be nearly as advantageous if the head were not of superb quality as well. With Akai's improved GX head, there's no worry on this point.

Made from low-noise crystal ferrite and superb-hard glass, the GX head is incredibly durable. And its new design has totally eliminated the contour effect, thus flattening frequency response at low ranges for much clearer bass sounds. The system as a whole maintains the ideal head gap for each function, improving head sensitivity and eliminating sound drop-out. What all these things add up to are  a better dynamic range and longer, trouble-free service life than possible with other heads. Not only do you get better performance, you receive economic savings as well.

Even the Transport System's new

A lot of study has gone into making this deck worthy of its top-line rank. Accordingly, one of the parts that has been radically changed is the tape transport system.

As you can see, its shape is different from that of other systems. That's because it has been made to conform to the optimum travel path of the tape. Thus the heads touch the tape at just the right spot, assuring the best recording and playback results. This improvement has been accomplished by the addition of two guide rollers, one on each side. And these rollers have been coated with rubber so that vibrations that would normally reach the head block are absorbed. The rubber also pre vents tape slip during transport. Which brings us to another plus of this system stable and steady tape travel. The parts that assure this-new, improved motor, GX heads and tension arms - are introduced hereafter.

One-way, Oil-damped tension Arms

The QX-635D employs one-way, oil-damped tension arms that assure normal transport speed is reached immediately after start. By the use of springs, they allow no tag that could damage your otherwise professional-style recordings. And, they feature a lock mechanism that makes it all the easier for you to thread the tape.

Three-motor, Direct Capstan Drive System

The best thing about this system is what you don't get rubber belts,idlers and other such parts that, in conventional systems, tended to produce vibration and wear. This, along with the fact that a separate motor is  used for each reel as well as for the capstan, ensures that the tape is transported smoothly at a fixed speed during both recording and playback. Longer service with a lower wow and flutter characteristic 9an incredible 0,03% WRMS) is the result.

The new C.P.G. AC Servo Capstan Motor

The capstan performsone of the most important functions in a tape deck, transpotrion of the tape. To guarantee this function is performed perfectly smoothly and steadlly. Akai has developed a new motor for the capstan drive. In the servo circuit of this motor, a Sample-and Hold circuit, is employed. The effect of this is to improve the response characteristics of the servo so that regular speed is always maintained and vibrations emanating from the motor are reduced.

Infra-red remote Control System

Unlike conventional remote control systems, the RC-70 poses no problems of distance or bothersome cords. Because it uses infra-red rays, it allows you to control the deck from across the room and is thus great for dubbing and air checking.

Dust Cover

To protect your tape and heads from harmful dust, this smoked dust cover accessory is available. Even with it attached total operation of the deck is possible.

Specifications

Track System:  4-track, 2-channel stereo/monaural system

Reel Capacity: up to 10-1/2: reel

Tape Speed:  19 cm/s ±0,8% (7-1/2"); 9,5 cm/s ±1,0% (3-3/4")

Wow and Flutter: 

Less than 0,03% WRMS (0,08% DIN 45 500) at 19 cm/s

Less than 0,04% WRMS (0,10% DIN 45 500) at 9,5 cm/s

Frequency Response:

30 to 27,000 Hz ±3 dB at 19 cm/s ( using WR tape)

30 to 21,000 Hz ±3 dB at 9,5 cm/s (using WR tape)

30 to 25,000 Hz ±3 dB at 19 cm/s ( using LN tape)

30 to 19,000 Hz ±3 dB at 9,5 cm/s (using LN tape)

Distortion:  less than 0,5% at 1,000 Hz, 0 VU

Signal-to-Noise Ratio:  better than 62 dB DIN 45 500 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:

Two  GX recording heads,

Two  playback heads,

Two  erase head

Motors:

One AC servo motor for capstan drive

Two AC eddy current motors for reel drive

Real Time Counter: up to 99 min, 59 sec. Less than ±15 %

FF & RWD Time:  120 sec. Using 550 m (1,800 ft) Tape

Output Jacks level/Impedance:

Line :  0,775 V (0 VU) Required load impedance more than 20 k Ω

Phone :  100 mV/8 Ω

Input Jacks Sensitivity/Impedance:

Microphone :  0,25 mV Required microphone impedance 600 Ω

Line :  70 mV / 100 k Ω

DIN Jack Input :  2,0 mV/10 k Ω

DIN Jack Output :  0,3V 

Power Requirement:  110 - 120 V, 220 - 240 V, 50/60 Hz

Dimensions (W x H x D):  440 x 483 x 256 mm (17,4 " x 19" x10,1")

Weight:  21 kg (46,4 lbs)