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.
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)
