Brand: Clarke & Smith Model:TR634 a professional, high-fidelity reel-to-reel recorder famously produced in the United Kingdom in the 60s Clarke & Smith were one of the few companies to use the Wright and Weaire tape deck mechanism, Vortexion and more famously, Ferrograph are the only others that spring to mind. C & S recorders were mainly produced for sale to education authorities, universities etc. Record and playback amplifiers were transistorised, and they had facilities to connect to 70-100V lines for use through public address systems. The TR-634’s wooden cabinet was very substantial, bringing the overall weight of the machine to nearly 50 lbs (22 kg) and an extra long carry-handle was fitted to enable two people to carry it. Tape distortion: 3% third harmonic at 1kHz for peak recording level / Speed stability: better than 0.5% at 7½ ips / Rewind speed: less than 1 minute for full 8¼” reel (1750 ft) / Audio output power: 10 watts with 1% distortion at 1 kHz / Input levels: high impedance microphone – 1mV / 300K low impedance microphone – 10mV line – 60mV / 0.5Meg / Output levels: ext speaker – 15 ohms high level line – 70V low level line – 1V peak at 5K / Speaker(s): 15 ohm elliptical Goodmans 9″ x 5″ / Dimensions (with lid): 17½ x 17 x 10″ ( 444.5 x 432 x 254 mm) / Weight: 46 lbs (21 kg) / half-track mono Category:Super High Fidelity Electronics:Solid State Country of Manufacture: United Kingdom Release dates:1964 - 1967 Tracks:1/2 Rec/PB Speeds: 3 3/4, 7 1/2 Max Reel Size("): 7" Number of heads: 2 Head Composition: Permalloy Head Configuration: Stereo # Motors: 3 Voltage(s): 220-240v Outputs: 1/4" Headphone Frequency Response:(all 3 dB): 7½ ips: 50Hz -15kHz Wow and Flutter:0.16% at 7½ ips. 0.2% at 3¾ ips Signal-to-Noise Ratio:better than 50 db unweighted at