1 9 7 7 may 1977
1 9 8 4 1984

Very successful LP drives sold as such in Japan and Germany. In other words : the last two markets really alive with high-fidelity... today !

All tagged with the HMV logo (His Master's Voice) and original components of the Laboratory series, these were either sold as drives or as integrated players, complete with Victor's UA tonearms and CL-P plinths.

The motor of both versions is a high torque 12-pole 24-slot DC-brushless but there is no Double Bi-Directional Servo as in the TT-101 topper.

Precise FG detecting section consists of 180 slots FG yoke with a magnetic disc and an FG circuit board with equivalent 180 printed coils for excellent precision of rotation.
The servo is applied on both positive and negative areas for the TT-81, as in the TT-101, but only on positive for the TT-71.

The TT-81 is a 101 sans Double Bi-Directional Servo and with a simplified pitch control system/display ; the functions and features are nevertheless the same : +/- servo, ±6Hz of 440Hz without switching off quartz-lock switch, soft-touch transport keys and electronic braking with reverse-current circuit.
The strobe is included in the servo loop to avoid AC fluctuations from affecting the actual reading.

The TT-71 is an 81 without +/- servo, no pitch control, an even simplified stroboscope circuit and a solenoid-activated braking pad.

Many integrated players were based on these two drives : QL-10 (TT-81), QL-7 (TT-81) or QL-F6 (TT-81 but with Double Bi-Directional Servo added) among others.

As drives or as integrated versions, the TT-81 and TT-71 sold like hotcakes throughout their long 8-year availability.

JVC TT-81, image 1 JVC TT-81, image 2 JVC TT-81, image 3
JVC TT-81 specifications
Title Value
TT-71 in clear brackets TT-71 in clear brackets
Motor : FG detecting Coreless DC Servo
Drive type : direct-drive
Servo type : Quartz Lock +/- Servo {Quartz Lock Servo}
Speeds : 33 1/3 & 45rpm
Pitch range : ±6Hz from 440Hz {fixed}
Speed change : electronic / electronic switches {electronic / touch sensors}
Rise time : 1s (33 1/3 rpm ; 120° turn) {1,4s ; 180° turn}
0,025% (WRMS)
Wow & flutter : 63dB (IEC)
S/N ratio : 73dB (DIN-B)
Stating torque : 1,3kg/cm {1kg/cm}
Overshoot : within 2% {within 2,5%}
Load characteristic : 0% under 120g
Drift characteristic : 0,0001%/hour
0,00003%/°C {0,00005%/°C}
Source variation within ±10V : unaffected
Quick stop : within 1s {within 1,6s}
Deviation from nominal rpm : within 0,002%
Turntable : 31,6cm / 2,05kg {31,3cm / 2,2kg}
aluminium diecast
Dimensions : 35,8 x 35,8 x 15cm {35 x 35 x 12cm}
Weight : 8kg. {6,2kg}
Mounting diameter : 28,1cm (round)
List price : 65,000¥ (T-81, 1977...1984)
42,000¥ (T-71, 1977...1984)
Optional : UA-7082 / 7045 / 5045 tonearms
CL-P3 / P2 / P1 plinths
X-1II / 1IID / 1IIE / 1IIED cartridges
Z-1 / Z-1D / Z-1E / Z-1ED cartridges
JVC TT-81 : 0 topic
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page online since : 2008
page updated : january 2011
page type : LGT / KNB
page weight : 212.22 Kb / 132.37 Kb

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