Legendary Akai 3-head deck with Glass GX heads, they do not wear! Direct monitoring possible. Play and records very good! Optically also near excellent. All contacts cleaned. All RIFA snubbers are replaced, and a capacitor. Clean in and outside. Sounds perfect! Also records with good tape. Akai GX-630D Type: Deck 2 Speed: 38, 19 cm (15, 7½ in) Frequency range: 30 - 28.000 Hz Reel Size: 10, 7 in Made: in Japan 4 Track stereo As is well known, the core of Akai's GX Head is made of crystal ferrite and is mounted and set in glass. The superior magnetic properties of the head material and special processing allowed the formation of a perfectly lineal shallow head gap, an acute head surface angle contour, and focusing of the magnetic field into a sharp oblong radius. This focused field system eliminates undue equalization, minimizes high frequency loss, and achieves a wider dynamic range. Further, sound drop-out is eliminated, head to tape contact and signal to noise ratio improved, and the hardness of the head materials provide dust free and wear free characteristics for longer lasting performance. The GX-630D exhibits a clear frequency response range to 25,000 Hz with Akai LN-150-7 tape. This model employs a 3 motor drive system with a new CPG (centre pole generated) AC Servo Motor for direct capstan drive. The quality of this outstanding motor plus the elimination of rubber belts and flywheels results in the realization of a 0.06% Wow and Flutter factor. Two eddy current outer rotor motors complete the drive system for completely stable performance and excellent tone quality. Impedance Roller and Tension Levers also add to tape travel stability. A Reel Size Selector and standard accessory 10-1/2" reel hub adapters facilitate the use of 5, 7, or 10-1/2" reels. Further, this model features quick tension wherein ideal take up and back tension is applied to the reels at the beginning of tape start for smooth operation regardless of reel size. 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) Heads (3) Erase: E4-260 Record: R4-200 (GX) Playback: P4-202 (GX) Motors 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. Weight: 25 Kg Including 2 NAB adapters Metal Reels are also included!! Tape sound good, but head cleaning is needed after playing. Carefully shipped but very heavy.