This GX Head Quadra-Sync 4-Channel Stereo Tape Deck marks the beginning of a new era in Tape Recording and Playback performance! A 4-Channel/2-Channel Mode Selector Switch instantly converts the unit for 4-Channel Surround Stereo or 2-Channel Stereo. To 15 ips tape speed.
GX HEAD FOCUSED FIELD RECORDING SYSTEM ASSURES LASTING NEW MACHINE PERFORMANCE
The GX-400D-SS employs GX 4-CH and 2-CH recording/playback heads for incomparable performance. The cores of these GX (glass and crystal ferrite) Heads are made of low noise crystal ferrite which has proven far superior to conventional head core materials. Unlike composite materials, this single crystallized element is non-pourous and, thus, there can be no material separation to eventually cause cracking or chipping of material
from the head surface. This also means that the magnetic properties peculiar to ferrite can be utilized for high electronic conversion capabilities resulting in better high range frequency characteristics.
The nature of this material enabled Akai engineers to construct a perfectly lineal shallow head gap and an acute angle head surface countour for perfect head-to-tape contact wherein the tape is exposed only to the part of the head's sharply focused magnetic field for improved head sensitivity and the elimination of sound drop-out. The core of the GX Head is mounted and set in pure glass of the same extraordinary hardness so that the head surface is always kept free of dust and magnetic particles, thus assuring wear-free characteristics for lasting new machine performance.
NEW QUADRA SYNC RECORDING TECHNIQUES FOR PERFECT SOUND SYNCHRONIZATION
This model incorporates Akai's new and unique Quadra-Sync recording system. As shown in the figure, on conventional units, sound monitored through headphones comes from the playback head. Therefore, to date, eventhough there were several kinds of multiple recording systems, because of the short time necessary for the tape to travel from the recording head to the playback head, sound synchronization was impossible.
However, with Akai's new Quadra-Sync system, the sound monitored is produced from the recording head, i.e., any of the recording head tracks can be switched to playback mode at will by means of the Track 1, 2, 3, & 4 QUADRA-SYNC SELECTOR SWITCHES for monitoring during recording on another track. Thus, program material on one track can be perfectly synchronized with any or all of the 3 remaining tracks. Use for professional split rehearsals or recording sessions, or to form a one man combo or a quartet with a single voice, etc. The uses to which Quadra-Sync can be applied are as unlimited at the imagination of the operator.
DUAL CAPSTAN DRIVE SYSTEM AND NEW SELF-LUBRICATING AC SERVO MOTOR GUARANTEES FRICTION FREE TAPE TRAVEL AND DRASTICALLY REDUCES WOW AND FLUTTER
symmetrical head block layout ...
A completely symmetrical head block layou dual capstan system provides smooth, friction _____e tape travel and identical 2-channel forward and reverse playback characteristics.
electronic governing circuit .
Akai's exclusive inner-rotor AC Servo Motor is employed in this model for capstan drive. With this system, the voltage supplied to the stator winding
is pulse detected and precisely controlled for maintaining completely stabilized motor revolutions. The use of this powerful electronic governing circuit not only means that proper revolutions unaffected by external load conditions as well as ideal torque is attained, but also that perfect protection from superfluous hum is realized and tape speed fluctuation is practically non-existent. self-lubricating ...
Further, this outstanding motor is completely self-lubricating. Two oil circulating mechanisms with cellulose fibers are installed within the interior of the motor. While the oil is circulating, shaft revolutions are always smooth and stable. Oil circulating speed is naturally adjusted according to motor revolutions and temperature. Therefore, trouble resulting from oil circulation suspension does not occur.
oil purified in cleaning process .
The cellulose fibers also act as filters to keep the o" clean during the circulating process, adding to evolutionary long lasing new machine per-
Two 6-pole eddy current inner rotor reel drive motors prevent vibration to complete the perfect motor drive system.
The combination of this AC Servo Motor and dual capstan drive system also drastically reduces wow and flutter.
AKAI'S EXCLUSIVE ONE-WAY AIR DAMPED TENSION LEVERS PROTECT TAPE
10-1/2" reels are often used for professional 15 ips recording and playback. However, to date, suffito prevent tape damage on the take-up reel side, and even then, there was concern when it came to the possibility of an accident during tape travel. To prevent this, the GX-400D-SS is equipped with two of Akai's One-Way Air Damped Tension Levers. When these levers drop, they are lowered with air-damping mechanism is activated to protect the tape from sudden tension. This air-damping works only in the case of suddenly applied tension and is not applied when the tension arm is lifted with normal pressure. Consequently, even when the tape is slack and an operating key is depressed, there is no danger of the tape being broken, or wound around the flange, etc. Further, this system prevents the tape from slanting, assuring even tape take-up.
DIVERSIFIED AUTOMATIC REPEAT AND REVERSE
model is equipped with a REPEAT/ REVERSE SELECTOR which by a simple setting provides 4-CH single or continuous playback/ rewind, single record/rewind, or record/rewind/ continuous repeat playback as well as 2-CH single or continuous forward and reverse playback, single record/reverse play, or record/continuous play-
DIRECT FUNCTION CHANGE CONTROL SYSTEM FOR SPEEDY MODE SELECTION
The control system of this unit is a one-touch direct function change system of superior engineering design for smooth and speedy mode selection. The necessity of depressing the Stop Key before changing modes is eliminated and because of the one-way air-damped tension levers, the tape is not damaged.
SOUND MIXING
Four each separate line and microphone input jacks and controls facilitate varied line and microphone mixing techniques. Professional type input level controls can be varied during regular or Quadra-Sync recording for special sound effects as
TAPE SELECTOR SWITCH FACILITATES USE OF LOW NOISE TAPE
This circuit varies the equalizer peaking volume at recording time according to the tape being used. The use of low noise tape will improve high range
CUE SWITCH AND PAUSE CONTROL FOR PRECISION CUEING AND TAPE EDITING
When the Cue Switch is depressed during fast forward or rewind mode, the tape is positioned to touch the playback head surface. Thus, recordings on the tape are easily located for faster and easier editing The GX-400D-SS is also equipped with Pause Control facilitating momentary tape travel suspension during recording or playback.
AUTOMATIC STOP AND SHUT-OFF
Perfect operating safety is assured with the automatic stop and automatic shut-off functions of this model. At the end of the tape, an automatic stop circuit is activated to stop reel movement. To offect automatic shut-off (to cut the power of the entire unit), simply set the Automatic Shut-Off Switch to ON position.
REMOTE CONTROL
All operating functions of this model can be remote controlled by using Akai Remote Control unit RC-17. Plugs into remote control socket on rear panel.
OTHER FEATURES INCLUDE
- Individual large and precise VU Meters, Controls, Inputs, and Indicator Lamps
- * Front and Rear Channel Headphone Jacks
- Reel Size Selector and standard accessory 15 ips Reel Hub Adapters
- * Din Jacks with High/Low Input Selector
STANDARD ACCESSORIES
| Empty Reel | .1 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 ips Reel Hub Ad | da | ap | ot | е | rs | .2 | |||||||||||
| Connecttion cords | .2 | ||||||||||||||||
| Spare Fuses | 1 | s | et | ||||||||||||||
| Operator's Manual | • | • | • | • | .1 |
OIL CIRCULATING SELF-LUBRICATING MOTOR . complements GX Head
performance.
Akai's policy of consistent quality is evid even in a single Motor Shaft.
The general performance of a Tape Deck is greatly influenced by motor capability and especially by the motor shaft. Smooth revolutions and endurance depend greatly upon the quality of the motor shaft.
Thus, as is the case of all Akai parts, carefully selected materials were used and our vast experience and newest engineering techniques as well as strict quality control and precise processing were not spared in the design and development of this outstanding motor.
Such skill, aside from the features outlined on the inside page, resulted in a motor shaft structure with a 60° hardness (Rockwell C Scale) and a 0.10µ (10/100,000 mm) degree of roundness. Further, an ultra precise polishing process resulted in a surface roughness of less than 0.05µ for the smoothest ever in motor revolutions and enduring performance.
TECHNICAL DATA
| Wow & Flutter Less than 0.035% RMS at 15 ips. 2-eddy current motor | 200 ft. Tape |
|---|---|
|
Less than 0.05% RMS at 7-1/2 ips. Fast Forward
Less than 0.08% RMS at 3-3/4 ips & Rewind Time |
|
|
Equalization
Correct equalization for playback of tapes
recorded to NAB curve. at 60/50 H2 Frequency Response |
" VU) (Required load
In 20 kΩ), Ω |
| 30 Hz to 18,000 Hz (±3 dB) (Low Noise Tape), Input Jack Microphone(4): 0.5 r 20 Hz to 26,000 Hz (±3 dB) (Regular Tape), Line(4): 100 mV/50 20 Hz to 24,000 Hz (±3 dB) (Regular Tape), Din Jack |
mV/4.7 kΩ,
) kΩ /10 mV (low) |
| Distortion Less than 1% (1000 Hz "0" VU) Semi-Conductors Integrated Circuits Linear IC: 4 Signal to Noise Ratio Better than 52 dB, 55 dB using Low Noise Tape Power Requirements 100 V to 240 V A.C. Erase Ratio Better than 70 dB Power Consumption 160 W Cross-Talk Better than 40 dB Dimensions 457 (W) x 590(H) x 2 Bias Frequency 100 kHz (18 x 23.2 x 9.5") | 240(D) mm |
| Heads Weight 31.2 kg (68.7 lbs) |
* For improvement purposes, specifications and design subject to change without notice.
• "Surround Stereo" used with permission of Vangard Records.
C04M7406277
Printed in Japan
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