JVC QL-7

1 9 7 7 1977
1 9 7 8
Plus
1978+

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.

JVC QL-7, image 1 JVC QL-7, image 2 JVC QL-7, image 3
JVC QL-7 specifications
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 : 0 topic
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page online since : january 2009
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page type : LGT / KNB
page weight : 254.95 Kb / 0 b

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