MANUFACTURER'S SPECIFICATIONS:
Speeds: 33 1/3 and 45 rpm.
Motor: 12-pole, 24 slot, d.c. servo.
Wow & Flutter: Less than 0.25 percent VV rms.
Rumble: Better than 63 dB (IEC-B).
Tonearm: Static balance.
Tonearm Effective Length: 254 mm (9.6 in.).
Tonearm Overhang: 15 mm (0.6 in.).
Tracking Force Range: 0 to 3 gms.
Dimensions: 18 3/4 in. (47.6 cm) x 15 3/4 in. (38.7 cm) x 6 1/4 in. (15.9 cm).
Weight: 23.8 lbs. (10.8 kg).
Price: $299.95.
When quartz-controlled, single-play, direct-drive turntables first came on the scene, they were extremely expensive, but the increasing demand combined with technological design and production improvements to bring prices down in a rush. An example of this is the JVC QL-7 which costs under $300.00 and boasts some of the same features and specifications as the super-luxury units costing up to $1000.00, plus it looks good in the bargain. True, it doesn't have the variable speed facility, but this refinement adds a lot to the cost and, in reality, very few people really need it. Again, there is no digital display, but in terms of wow and flutter, rumble, and general good engineering nothing has been skimped on.
The 12-pole d.c. motor is servo-controlled with a quartz-crystal reference, and an integral signal generator provides the correction pulses. The 4-lb. die-cast platter is surrounded by a polished, angled ring on which the controls are mounted. The small thumbwheel On/Off switch is on the left, and next to it, towards the front, are three tiny contact switches for 33 1/3, 45, and Stop. The strobe light is located behind a plastic window at the center, with the relevant markings cut into the side of the platter.
The tonearm is the conventional S-shaped type measuring a bit under 10 [....]
(Source: Audio magazine; Dec. 1978)
Also see:
JVC QL-Y5F turntable (ad, Feb. 1981)
Infinity Black Widow Tonearm (Mar. 1979)
Shure V15 Type V Phono Cartridge (Nov. 1982)
Signet TK10ML moving-magnet phono cartridge (Feb. 1985)
= = = =