Sony L-750 (dates unknown)
Little formal documentation survives for the Sony L-750, but the period record is enough to identify it. It was a Beta-format videocassette, the 180-minute length in Sony's L-series tape line. A 1981 videotape survey in High Fidelity (1981, p.267) listed the L-750 at 180 minutes, next to the shorter Beta cassettes L-250 (60 minutes) and L-500 (120 minutes).
By 1989 the L-750 came in several grades. A HiFI-Stereo tape roundup (1989, p.91) listed the L-750 HG high-grade at $5.99 and the L-750 SG standard-grade at $4.99. Play times were roughly 1⅔, 3⅓, or 5 hours, depending on the VCR's speed setting. The same listing showed an L-750 EG Plus at $8.49, running 1.5, 3, or 4.5 hours. Sony's own advertising of the mid-1980s - built around famous performers and the idea of capturing legends before they disappeared - promoted the tape line generally, not the L-750 specifically (Audio, September 1984, p.32).
Production years, launch pricing and any formal technical specification sheet are not documented. The L-750 is a workaday tape that must have sold in enormous numbers, yet it left almost no paper trail beyond price lists and ads.
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