YAMAHA P-650

Commentary

A record player that uses Yamaha's original ARS arm and quartz PLL servo.

The tone arm uses an ARS (Anti Resonance Straight) arm developed by Yamaha to reduce any resonance of the arm itself.
The ARS arm has a symmetrical structure with a straight pipe so that torsional vibration hardly occurs. In addition, a large rectangular balance weight placed as close as possible to the fulcrum, a span between pivots that is more than twice the normal size, and a rubber damper for the angular contact bearing of the bearing are used to improve sensitivity and eliminate resonance due to backlash. In addition, the pipe holder is large and robust, and a double structure 30 mm from the fulcrum is used to deal with flexural vibration at the front and back of the pipe.
The low-pass resonance frequency of the arm was determined to be 12 Hz from the result of measuring the reproduction spectrum of the direct cut record, and the effective mass of the arm was determined by calculating the average mass and compliance of 30 typical MM/MC type cartridge models.
The height of the arm can be adjusted in P-650.

The head shell part uses an insertion type that is highly reliable and easy to replace the cartridge. In addition, the needle pressure adjustment is a sliding weight type.

The cartridge uses CG-6700, a VM type cartridge.

A DC4-phase 8-pole coreless Hall motor is used as the drive motor.
This motor has no cogging in principle, and is a non-contact type using a Hall element, so mechanical and electrical noise is minimized.

The servo circuit uses a quartz PLL servo that controls with the accuracy of the crystal.
In this circuit, the rotation speed of the turntable is detected by an all-around integration type FG (frequency generator), and highly accurate rotation is obtained by comparing the phase with the signal from the crystal oscillator.

Uses front operation with a switch so that it can be operated even with the dust cover closed.
In addition, auto lead-in, Oatley turn, auto cut and auto repeat are possible with full auto mechanism.

The cabinet is made of BMC material and uses a 3-mm-thick acrylic resin dust cover and a special rubber W-shaped fold-back insulator to improve the howling margin.

Model Rating

Type	Record player
Phono Motor Section
Drive system	Direct drive
Servo system	Quartz rock
Motor	DC4-phase 8-pole coreless Hall motor
Number of revolutions	2 Speeds (33 1/3rpm, 45 rpm)
Turntable	30 cm Aluminum Die Cast, 1.6 kg (Including Rubber Sheet)
Moment of inertia	210 kg / cm2(Including Rubber Sheet)
Tone Arm Section
Type	Straight arm
Total Length	290mm
Effective length	222mm
Overhang	16mm
Horizontal tracking error angle	-1 ° ~ 3 °
Needle pressure application system	Sliding Weight Method (0 ~ 3g, 0.1g step)
Effective mass	11g (when needle pressure is 1.5g, cartridge weight is not included)
Compatible Cartridge	2.5g ~ 10g
Arm initial motion sensitivity	Vertical : 10 mg Horizontal : 30 mg
Arm lifter	Oil dump type queuing
Anti-skating	Spring lever type
Arm height adjustment	± 2.5 mm (Lock Cam Type)
Head shell	Insertion Type, Dead Weight 2.5g
PU cable	Capacity : 100 pf Reciprocating resistance : 1 Ω
Cartridge Section
Type	VM Type (CG-6700)
Output voltage	2.5 mv (1 khz, 5cm/sec, Peak45 °)
Channel separation	18 dB or More (1 kHz)
Electrical impedance	2.8k Ω ± 30% (1 kHz)
Proper needle pressure	2.0g ± 0.5g
Dynamic Compliance	12x10-6cm/dyne(100Hz)
Weight	6g
Automatic Control Section
Auto function	Auto Lead In (17 cm, 30 cm) Auto return Repeat Cut
Body Part
Cabinet	BMC(Bulk Molding Compound)
Finish	Silver
Dust cover	800g acrylic resin
HINGE	Fleece Top Removable
Insulator	W-shaped Folded Rubber
<General>
Signal-to-noise ratio	77 db (DIN-B, IEC 98A weighted)
Wow flutter	0.015% (FG Direct)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	5W
External dimensions	Width 440x Height 132x Depth 372 mm
Weight	6.8kg