Akai GX-77 Service Manual

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Specifications and Main Features

Track System: Dual Channel System with a 4 Track
Reel Capacity: 175mm Min. With Reel
Heads:
Two GX heads for recording.
Two GX heads for playback.
Two erase heads.
Motors:
A single FG Servo DC motor attached to the capstan drive.
A pair of DC motors attached to the reel.
Tape Speed:
19 cm/s +/- 0.8%(7 ½’)
9.5 cm/s +/-1.0%(3 ¾’)
Wow & Flutter:
19 cm/s- WRMS is less than 0.03% and in accordance to DIN 45500 is 0.07%
9.5 cm/s- WRMS is less than 0.04% and in accordance to DIN 45500 is 0.10%
Tape Winding Time: 80 sec time to end use of a 360 m(1200 ft) tape
Frequency Response (Using a EE Tape):
19 cm/s recording- 25 to 33,000 Hz + 3 dB (-20 VU) and a 25 to 26,000 Hz + 3 dB (0 VU)
9.5 cm/s- 25 to 15,000 Hz + 3 dB 0 VU
Signal to Noise Ratio: Outdoes 63dB while recording at 19 cm/s as per DIN 45500
Harmonic Distortion: A minimum of 0.5 percent while recording at 19 cm/s.
Input:
Impedance of Microphone: 600onz

-Line:70mv(input impedance:47k ohms)

Output:

-line:0.775 at 0 v,u

-required load: more than 20ohm

-phone: 1.3mv at 8 ohm

-din Input: 2.0 mv(input impedance:10k ohms)

-output: 0.3 volt

-dimensions: 440 x 244 x 227mm

-weight 17.0 kg

-power requirements as follows:

110/120/220/240 for everyother country
100v 50/60 for japan
120 60 for USA and canada
220 50 for other parts of europe
240 50 for UK and australia
Power consumption:
JPN 30W
U/T: 50W csa 50W
Note: For improvement purposes, specifications and design are subject to change without the notice.

Frequently Asked Questions

Q1: what is the tape speed of the device?

A1: the tape speed is 19 cm/s +0.8%(7-1/2ips.) and 9.5cm/s +1%(3-3/4ips.)

Q2: What kind of heads does the device possesses?

A2: As for the device, it possesses GX heads for media recording (x2), GX heads for media playback (x2), and erase heads (x2) as well.

Q3: Can you kindly inform me the weight of the device?

A3: With great pleasure as the weight of the device is 17.0 kg which is equivalent to 37.5 lbs.

Q4: What are the power requirements for this device?

A4:

For Japan it would be a an input of 100V, 50/60 Hz.
While for USA and Canada a 120V 60 Hz input will suffice.
For the Continent Europe, excluding the UK, a 220V and 50Hz would be ideal.
For UK, Japan and Australia, the best fit voltage will be a 240V 50Hz.
While It would require a 110/120/220/240V, 50/60 Hz switchable for the other countries.

Q5: Also might I know what is the signal to noise ratio of the device?

A5: In respect to the mentioned query, the signal to noise ratio is greater than 63 dB in 19 cm/s during DIN 45500.

Q6: Finally and not the least, what is the time to wind up 360 meters of tape?

A6: In order to wind 360 m (1200 ft.) of tape it requires approximately 80 seconds.

Q7: What is the frequency response using a EE tape?

A7: The frequency response is 25 to 33,000 Hz at +/- 3 dB (–20 VU) for a speed of 19 cm/s while it ranges from 25 to 26,000 Hz at +/-3 dB (0 VU) for the same speed. At 9.5 cm/s it becomes 25 to 25,000 Hz while at +/-3 dB (-20 VU) the speed is 9.5cm/s at 25 to 15,000 Hz the speed remains the same at +/-3 dB (0 VU).