Audio Database

The

AKAI GX-77 GX-77: 128,000 yen(August 29, 1981 release)
GX-77BL:132,000 yen(August 29, 1981 release)

Description
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The reverse recording-play open deck which aimed at more nearly quality recording by EE tape correspondence or lambda (Lambda) loading.

EE tape is newly developed tape that uses the magnetic material for high-density record, is used as the tape for videos, or a chromium tape for cassette decks, and is conventionally proud of high coercive force and a big residual magnetic flux density.
In GX-77, in order to pull out the characteristic of this EE tape, the amplifier circuit, recording head, and erasing head which were designed newly are carried, and the high region characteristic is greatly raised by this EE tape correspondence.

In order to demonstrate the characteristic of EE tape to the maximum extent and to aim at much more dynamic range expansion,The constant of the play equalizer in EE position is reduced by 19 cm/s, a noise level is reduced as 3180+50 (it is 3180+90 in LH position) by 3180+35 (LH position 3180+50) and 9.5 cm/s, and the dynamic range is also improving.

Moreover, the basic characteristic about the equalizer of EE position and compatibility other than bias is a thing according to international standards, such as IEC.

Original lambda loading a tape runs is adopted as the form of lambda, and it is not necessary to take about between a tension arm, pinch rollers, etc. like before in a mechanism part.
If it equips with a tape and recording or a play switch is turned on, a central loading roller will carry out differential and will set to ideal run conditions. Moreover, since lambda loading is symmetrical, the characteristic with a uniform round trip is acquired.
arranging symmetrically the three head each system for a round trip in housing of lambda loading -- a round trip -- the uniform characteristic is realized. Moreover, the head needed to be rotated according to this structure at the time of reverse, or it did not need to be made to slide, and shortening of reverse time is also realized.
Moreover, the loading roller is carried in the center, this roller bisects tape pass, the characteristic is raised, and the abnormal-conditions noise is stopped by playing the role of a scrap filter simultaneously.

By using form at the tip of a head core as a compound R type, the contour effect has been improved and the low-pass characteristic is improved. Moreover, the shield between trucks was strengthened and it has succeeded also in low-crosstalk-ization.
Moreover, elimination rate sufficient also at the time of EE tape use has been obtained by adopting a powerful double gap erasing head as an erasing head.

A FG servo direct-current motor is carried in a capstan drive, and direct-current motor is carried in the reel drive. The run which was stabilized as for the round trip is conjointly realized with the high precision capstan of special finishing.
Furthermore, the tension servo was adopted so that a tape tension might always be kept constant, the tape run was smoothed more, and the shake of sound is lost.

3 motor system of the system control by a microcomputer, 6 head composition of three both-way heads each, and a double capstan drive etc. has realized quick reverse for 0.4 second.

The reverse selector of a three-step change is carried and the one-way recording play of an outward trip and a return trip, the both-way recording play from an outward trip/return trip, and an endless play are possible.

Half turn master volume in consideration of the real-time electronic digital counter and the usage easy of the part and the second display,The timer start mechanism for absence recording, cue / review mechanism, 2 color with the Max hold 16 segment LED bar meter, output volume, and bias adjustment volume with variable }30% are carried.

Remote control operation is possible by an optional remote control unit.
The dust cover of a photograph is an option.


The lambda
Counter

Rating of a mode
Form Reverse recording-play open deck
Truck system Four two truck stereo system
Reel 17 type (No. 7)
Magnetic tape velocity 19 cm/s (}0.8%), 9.5 cm/s (}1.0%)
Wow and flutter 0.03%Wrms(19cm/s)
0.04%Wrms(9.5cm/s)
Frequency response
(at the time of EE tape use)
25Hz-33kHz}3dB (19 cm/s)
25Hz-25kHz}3dB (9.5 cm/s)
Distortion 0.5% or less (1kHz, 3rd THD)
Signal to noise ratio 65dB(19cm/s)
Head GX recording head x2
GX playback head x2
Erasing head x2
Motor FG servo direct-current capstan motor x1
direct-current reel motor x2
Fast forward rewinding time About 80 seconds (at the time [ No. 7 reel 360m ] of tape use)
Input level Line: 70mV
Output voltage Line: 0.775V
Headphone: 1.3mW
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 28W
Dimensions Width 440x height 244x depth of 227mm
Weight 17.0kg
Attachment Connecting cord x2
Empty reel x1
Sensing tab x1
Option Dust cover direct-current-77 (6,500yen)
Counter memory backup adapter MP-515 (2,500yen)
Remote control unit RC-21 (6,000yen)