Improvement in tape reproduce heads, now record equalization techniques, and tape have brought about the introduction of four-track stereophonic tapes for entertainment uses. The cost of the production of these tapes has been reduced by the savings in the amount of tape requried for a given length of recording and by improvements in tape duplicating equipment. The Ampex S-3300B tape duplicator has been designed particularly for the production of 7-1/2 and 3-3/4-ips four track stereo tapes. The master reproducer operates at either 120 or 60 ips and the slaves operate at 60, 30, or 15 ips. the duplicating speed is twice as fast as that of previous models of Ampex tape duplicators. The 15-ips four-track master tapes required for this system are 1/2 in. wide with AME record characteristics. Record pre-emphasis circuits are provided to suit master to slave speed ratios of 120:60, 60:30, and 60:15 ips.
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