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Sound Rating: 7.33 / 10 # Owners: 3
Relaibility Rating: 8 / 10 Views: 1004 # Reviews: 2

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Technical Details

Brand: Akai


Category:Mid High Fidelity


Electronics:Solid State


Country of Manufacture:Japan

Release dates:1980 - 1986

Original Price: $800

Tracks:1/4 Rec/PB

Speeds: 3 3/4, 7 1/2

Max Reel Size("): 10.5"

Number of heads: 3

Dimension: 465 x 440 x 240mm

Head Composition: Ferrite

Head Configuration: Stereo

# Motors: 3

Auto Reverse?:No

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

Outputs: RCA

Frequency Response:15 ips: 20Hz to 28kHz at 15 ips ( 3dB) (PRO version only)

Wow and Flutter:less than 0.09% at 7.5 ips (less than 0.0% at 15 ips for PRO version)

Signal-to-Noise Ratio:57 dB at +3 dB (GX-630D) 67 dB (GX-630DB) 60 dB (GX-630D-PRO)

Sound quality rating:7 / 10

Long-term reliability rating: 8/ 10

Weight: 19 kg.

Additional Details


One of the most popular of the GX-600 series, the GX630D (despite its model number) is an earlier version of the GX-620 and the 10½ reel” version of the GX-270D, without auto-reverse functionality.
The capstan motor was of the direct drive type and provided two speeds, 3¾and 7½ ips.
A Dolby version, the GX-630DB was available a little later, and also a half- track version, the GX-630D/PRO. This ‘PRO’ version had a larger diameter capstan shaft and provided the higher speeds of 7½ and 15 ips.

Additional Info

US Prices (New)
GX-630D: $800.00, GX-630D-PRO: $820.00, GX-630DB: $910.00
Track system
quarter-track stereo (630D-PRO was half-track stereo)
(3) Erase: E4-260 Record: R4-200 (GX) Playback: P4-202 (GX)
Capstan  Direct Drive AC Servo SCM2-24KJ – Reel motors: Eddy current outer rotor motor; model: XO24-TD
Tape speeds
7½ and 3¾ ips (15 and 7½ for GX-630 PRO)
Frequency response ( 3dB)
15 ips: 20Hz to 28kHz at 15 ips (PRO version only)
7½ ips: 20Hz to 25kHz
3¾ ips: 30Hz to 19kHz (std. version only)
Wow & flutter
less than 0.09% at 7.5 ips (less than 0.0% at 15 ips for PRO version)
Signal to noise ratio
57 dB at +3 dB (GX-630D) 67 dB (GX-630DB) 60 dB (GX-630D-PRO)

Variations on the GX 630

GX-630D- Quarter track stereo, 3 3/4 & 7 1/2 ips.

GX-630D-B- with integral Dolby B noise reduction.

GX-630D-SS- 4 track, 4 channel Quadraphonic Stereo, 3 3/4 & 7 1/2 ips. Can be also used for quarter track two-channel stereo recording and pb. It does not have a sync mode for track-by-track overdubbing.

GX-630D PRO- Half track stereo, 7 1/2 & 15 ips.

A good pictoral service article on audio Karma about replacing the noisy transistors


All transistors and capacitors changed. Price I payed for (in 2020) was together with 8 Basf metal reel  tapes I own three tape recorders and this one is by far the best because,,, and I would not hesitate to recommend to anybody
Sound: 7
Performance: 8
3 years ago

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