Category:Super High Fidelity
Country of Manufacture:Japan
Release dates:1979 - 1983
Original Price: $995
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 10.5"
Number of heads: 6
Dimension: 19 x 17.4 x 10" (483 x 440 x 256mm)
Head Composition: Ferrite/Glass
Head Configuration: Stereo
# Motors: 3
Voltage(s): 100v Japan, 110-120v, 220-240v
Outputs: RCA, 1/4" Headphone
Frequency Response:30Hz to 27kHz (3dB 7½ ips)
Wow and Flutter:.03% at 7½ - .04% at 3 3/4 ips
Signal-to-Noise Ratio:better than 62 dB
Sound quality rating:7 / 10
Long-term reliability rating: 8/ 10
Weight: 46.4 lbs (21.0 kg)
The GX635 and 636 were very similar, all having a symmetrical 6-head design (Glass Crystal) which permitted both playback and recording in both directions.
The GX-635D was the first unit in the series (1979) and was very likely Akai’s first recorder with IC logic controlled tape function controls. It had a pitch control function, recording mute and a programmable record timer. Line and mic mixing was also possible with separate microphone and line-in level controls. These controls were fitted with a “memory ring” which rotated when the level was increased but remained in position when decreased, giving a ‘memory’ of the setting. The direct drive, AC servo capstan motor is frequency-controlled.
Akai also marketed a GX-635DB with Dolby B which did not have the timer switch. Both models were also available with a flat black finish but were sold in smaller quantities as silver was still holding greater popularity for audio equipment of the time.
New price in USA $995 (an extra $100 for the Dolby model)
Heads (6) erase: E4-241 (x2), recording: R4-241 GX head (x2), playback: P4-251 GX head (x2)
Motors (3) 1 x AC servo Direct Drive capstan, 2 x eddy current, Direct Drive outer rotor motors (XO24-TD)
Frequency Response 7½ ips: 30Hz to 27kHz – 3¾ ips: 30Hz to 25kHz (3dB)
Signal-to-Noise Ratio 62 dB
Wow and Flutter 0.03% at 7½ ips – 0.04% at 3 3/4 ips
Rewind Speed 120 seconds for a 1800 ft tape
Distortion 0.4% Inputs: Mic: 0.25 mV. Line: 70 mV impedance 100 Kohm. DIN: 2mV / 10Kohm
Outputs Line: .775 / 20 Kohm.
Headphones 100 mV at 8 ohms. DIN 0.3V
Real Time Counter 99min. 59 sec.
Pitch Control +- 6%