| Title | Value |
|---|---|
| Motor : | DC servo |
| Drive system : | direct-drive |
| Speeds : | 33 1/3 & 45rpm |
| Speed detection : | integrated FG |
| Servo system : | Quartz servo |
| Startup time : | < 1,4s (=180°) |
| Quick-stop time : | < 1,6s |
| Wow & flutter : | < 0,025% (WRMS) |
| < 0,04% (DIN) | |
| < 0,013% (WRMS ; K&K) | |
| S/N ratio : | > 78dB (DIN-B) |
| Startup torque : | >1kg/cm |
| Overshoot : | < 2,5% |
| Speed deviation : | < 0,002% |
| Load characteristics : | 0% (<120g load) |
| Drift / hour : | 0,0001% |
| ±10% voltage drift : | 0% |
| Thermal drift : | 0,00005% / °C |
| Speed change : | electronic |
| Platter : | 31,3cm / 2,2kg |
| diecast aluminium | |
| Tonearm : | statically balanced |
| with new gimbal system on | |
| Tracing-Hold | |
| Effective length : | 24,5cm |
| Tracking error : | +1.48° / -1.31° |
| Overhang : | 15mm |
| Tracking force : | 0...3g (0,1g steps) |
| Max. cartridge weight : | 14,5...23,5g |
| VTA : | 40...60mm |
| Dimensions : | 47,7 x 40,1 x 16,2cm |
| Weight : | 10,8kg. |
JVC QL-7
1977
Peak of the hi-fi years : vinyl rules.
The QL-7 is a TT-71 drive with a Victor-made plinth and Victor's own UA-5045 tonearm.
Technically less advanced than a QL-F6 or TT-101 : only one Servo Lock is present (instead of the bi-directional couple used in the TT-81, TT-101, TT-801, QL-10 and QL-F6) and the motor is a "simple" DC Servo.
Since the UA-5045 tonearm is a high-end separate from Victor, and earlier by more than a year, there is no continuously variable "Q" oil-damping for both horizontal and vertical planes as in the QL-F6 - and oil damping was only a fad, wasn't it ?
The black base seen here from US and DE catalogs was for export only : the japanese (and UK) QL-7 had the nicer, bigger and heavier CL-P1 Victor wood veneered plinth.
Victor's CL-P bases are made of four layers of high-density particle boards and three layers of special inorganic material ; I don't know if that structure was retained for the export black base.
Bar the 'power on' switch (silver in Japan, black elsewhere), and the added top badge (badge for export, printing mask for Japan), the rest is the same.
A real TT-71 in repair at the indispensable amp8.com.
page online since : january 2009
page updated : not yet
page type : LGT / KNB
page weight : 254.95 Kb / 0 b
page updated : not yet
page type : LGT / KNB
page weight : 254.95 Kb / 0 b
- TVK Talk Forum
- TVK Museum
- Specials
- Timelines
- Utilities
- Games