Some info on the JVC QL-Y44F
from
https://audio-heritage.jp/VICTOR/player/ql-y44f.html (translated by Google Translate)
A full-auto player with Victor technology such as a large turntable, high-torque low-vibration motor, and electronically controlled arm.
The turntable has adopted a 32.7 cm long turntable, and the inertial mass is increased by 20% compared to the conventional level machine by the large turntable. Moreover, the low wow and flutter and the high SN ratio are realized by adopting the high torque and low vibration coreless DD motor.
Moreover, the stability of the quartz lock is raised by the full circumference FG speed detection system and the double servo quartz circuit.
Non-contact electronic control is adopted as a fully automatic system.
The presence or absence of a record and the size are automatically detected by the pulse count of the optical sensor and the microcomputer, the number of rotations is automatically selected, and the arm is accurately sent to the start position. In addition, a rotation speed manual changeover switch is also installed to support records with a special rotation speed.
If you want to hear from the middle of the record, you can freely move it to the left or right with the arm operation button. It is also possible to move the arm by hand during operation.
The highly rigid tapered straight pipe arm which used the electro servo system is adopted as a tone arm.
In the electroservo system, a linear motor is directly connected to the horizontal rotation axis, and while controlling the fully automatic operation with a microcomputer, the resonance of the super-low range generated in the horizontal direction is suppressed. It is an electronic Q dump system that prevents needle skipping and distortion and improves the stability of cartridge tracing.
Also, anti-skating is electronic.
The wood cabinet of the rose tone mirror finish is adopted as a cabinet.
Moreover, the newly developed large insulator is adopted as a leg.
MC type cartridge MC-100IIEB which improved the high region characteristic is adopted as a cartridge.
Model Record player
motor FG detection coreless DC servo
Wow and flutter 0.008% (RMS, rotating part FG method)
SN ratio 80dB (DIN-B)
Tone arm Electro servo method
cartridge MC type (MC-100IIEB)
Frequency characteristic 20Hz ~ 50kHz
Output voltage 0.3 mV
Replacement needle DT-100IIEB (6,000yen)
External dimensions Width 435x height 170x depth of 387mm
weight 9.8 kg
from
https://www.audiokarma.org/forums/i...s-x75-in-the-trunk.633871/page-3#post-8456477
The PS-X65 is ‘half a Biotracer’, although Biotracer was never mentioned by Sony in the PS-X65 literature. It has the same electronic damping and anti-skating, but only in the horizontal tonearm movement direction, not vertically.
So the PS-X65 tonearm is very similar to the PS-X75 tonearm, minus the vertical damping – it will be better than un-damped tonearms, but not as good as electronic fully-damped ones on record warps, or in the wide range of cartridge compliances which can be fitted. However, changing the weight of the PS-X65's headshell will help in allowing a wider range of cartridge compliances to be a good match with the tonearm.
The PS-X65 came out before JVC’s first similar model, the QL-Y3F, which also only has the horizontal electronic damping and anti-skating. JVC obviously decided they’d have to match all the Sony electronically-damped models with their own models with very similar features!
Sony dropped the idea after the PS-X65, but JVC superseded the QL-Y3F with the QL-Y33F a year later (1982), and in 1986 the QL-Y44F, all with horizontal-only electronic damping and anti-skating. JVC called the QL-Y3F, QL-Y33F and QL-Y44F tonearms ‘Electro Servo’, without the ‘Dynamic’ they included on their fully-damped Electro-Dynamic Servo tonearms (JVC’s equivalent to Sony’s Biotracers)! However, Sony’s marketing people didn’t have a catchy and technical-sounding name for the PS-X65 tonearm.
