Akai GX-636 

Track system: 4-track, 2 channel stereo system 
Tape speed: 3.75 ips and 7.5 ips 
Max. Reel Size:  10.5 in.
Total Wow and Flutter: Less than 0.07% @ 7.5 ips 
Frequency response: 
30 to 27,000 Hz ± 3 dB @ 7.5 ips 
30 to 20,000 Hz ± 3 dB @ 3.75 ips 
S/N ratio: Better than 65 dB 
FFWD/RWD time: 75 sec. using a 1.200 ft tape 
Main motor: SCM200 
Reel motors: Eddy current 
outer rotor motor; model: XO24-TD 
Erase Head: E4-241 (x2) 
Recording head: R4-241 GX head (x2) 
Playback head: P4- 251 GX head (x2) 
Dimensions: 17-3/8" wide x 19" tall x 10" front to back including the feet 
Weight: 46 lbs.