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Sound Rating: 6 / 10 # Owners: 1
Relaibility Rating: 7 / 10 Views: 339

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Technical Details

Brand: Akai


Category:Mid High Fidelity


Electronics:Solid State


Country of Manufacture:Japan

Release dates:1976 - 1980

Original Price: $540

Tracks:1/4 Rec/PB

Speeds: 3 3/4, 7 1/2

Max Reel Size("): 10.5"

Number of heads: 3

Dimension: 20.9 x 17.3 x 10.4"

Head Composition: Permalloy

Head Configuration: Quad

# Motors: 3

Auto Reverse?:No

Voltage(s): 110-120v, 220-240v

Outputs: RCA

Frequency Response:30 - 21000 Hz (+-3dB) 7.5 ips

Wow and Flutter:.06% at 7½ ips - .1% at 3¾ ips

Signal-to-Noise Ratio:50 dB

Sound quality rating:6 / 10

Long-term reliability rating: 7/ 10

Weight: 45.5 lbs (20.7kg)

Additional Details


The GX-630D-SS (along with the GX-270D-SS) were the last of Akai’s Surround Sound series.
Both these models featured the Quadra Sync feature which meant that they could be used as a mini home-studio, much like the Teac A3440S. In ‘Quadra Sync’ mode, the pre-recorded tracks could be monitored via the record head, avoiding the time delay normally associated with the playback head and thus giving ‘Sync’ for the subsequent recorded parts. The recorder could be used in either 4-channel surround sound or stereo modes.
A three motor drive system was employed, with Akai’s new CPG (Centre Pole Frequency Generated) AC servo motor for direct capstan drive and two eddy current outer rotor motors for the reels. A pitch control function gave a 5% playing speed modulation. Other features included four microphone inputs, two headphone outputs and a 10½ ‘” reel capacity.


Additional Info

Year 1976
Price when new (in the UK) £540
Track System Quarter-track four-channel Surround sound, quarter-track stereo
Heads (3) Erase, GX playback and GX record heads
Motors (3) One AC servo capstan motor and two eddy current outer rotor motors
Maximum reel size 10½ ”
Tape Speeds 7½ & 3¾ ips
Frequency Response (3dB)
7½ ips: 30Hz to 21kHz
3¾ ips: 30Hz to 15kHz
Wow & flutter 0.06% at 7½ ips, less than 0.1% at 3¾ ips
Signal to noise ratio 54 dB
Crosstalk 40dB
Distortion 0.5%
Bias Frequency 100kHz
Outputs Line: 0.775V, two stereo headphones sockets
Dimensions 20.9 x 17.3 x 10.4″ (530 x 440 x 265mm)
Weight 45.5 lbs (20.7kg)


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