Dual 1229

Commentary

A turntable incorporating manual / automatic functions and operability into the design criteria of a professional-grade turntable.

The 1229 offers four playback modes : a manual turntable, a single-play turntable that automatically plays a single record, a multi-play turntable that automatically plays six consecutive records, and repeat play.

In manual play, the tone arm returns automatically and the turntable stops rotating when the play is finished. In single play, it starts with one action of the start switch. When it stops, it returns automatically and the turntable stops as in manual play.
In automatic multi-play, a single play spindle is replaced with a multi-play spindle, and six records are set on top of each other. After that, if you press the start switch, all of them operate automatically. After six consecutive playing is finished, it returns automatically and the turntable stops rotating.
Repeat Play is a mode that uses a multi-play spindle and 45-turn donut adapter to play the same record repeatedly.

The spindle for single play is designed to rotate together with the turntable, and there is no uneven rotation caused by frictional resistance between the center hole of the record and the spindle.

We have adopted die-cast turntables.
There is a 50/60Hz strobe on the back of the turntable, which can be monitored with a strobe mirror on the panel. By rotating the ring, you can adjust the angle for easy viewing, and you can easily switch between 50 Hz and 60 Hz.

The pitch control adjusts the speed by ± 6%.

A newly designed synchronous continuous pole motor is used as the drive motor.


The tone arm is made of a light metal pipe with an effective length of 222 mm. This was the longest design for an auto turntable type player at that time. The tracking error is 1 ° 30 "for a record diameter of 110 to 293 mm. The resonance is between 8 and 14 Hz, below the audible frequency, and is designed to be higher than the lowest resonance frequency of the 1229 chassis suspension of 4.8 Hz when the cartridge is installed.
The support is a gyro-gimbal type support structure that Dual adopted for the first time as an auto turntable type player. This system uses high-precision miniature bearings for the support points of two inner and outer rings. By improving the sensitivity of the tone arm, it is also compatible with four channel record playback of a discrete method.

The anti-skating mechanism corresponds to the needle pressure and the type of needle tip. It is a dial system with red letters as elliptical needles and white letters as conical needles.

The needle pressure can be adjusted by turning the dial. The error of the direct reading value is within ± 0.1g. When the needle pressure of 3g to 5g is applied, it can be adjusted by rotating the counterweight. One rotation can adjust the needle pressure by 0.5g.
1229 is used with a needle pressure of 0.25g or more.

The counterweight part has a weight and a shaft pre-assembled, and the weight is dumped to the shaft via a rubber shock absorber to absorb resonance and shock of the arm.
In addition, when adjusting the 0 balance, this counterweight can be approximately balanced at the front and rear of the whole including the shaft, and by further rotating the counterweight it can be accurately balanced.

Equipped with a mode selector, an accurate vertical angle can be obtained.
With auto-turntable, the vertical angle differs between single-play and multi-play. With 1229, you can obtain an accurate vertical angle by changing the height of the supporting point of the tone arm with the mode selector. With multi-play, it becomes 15 degrees when playing the third record.
This mode selector also has a safety lock function and is designed so that when the multi-play spindle is installed, the automatic mechanism does not operate unless it is in the multi-play position.

The head shell is die-cast and the cartridge holder conforms to the EIA standard and is compatible with most commercially available cartridges.
The cartridge holder can be easily attached and detached by moving the finger of the head back and forth.

It is equipped with queue control (arm elevation mechanism) using Viscos dump cylinder.


There were 3 types of player cabinet as an option sold separately.
The CK-20/CH-20 is an original player case made by Dual. The front side of the base can be opened and closed, and spare shells, 45 adapters, multi-spindles, etc. can be stored. In addition, the acrylic cover can be fully opened on the upper side, and the front half can be opened and closed with a special acrylic hinge. In addition, the special hinge is detachable so that it can be used with the cover on during multi-play.
DB-31/DCOV-3 is a case made in Japan similar to the original. The front of the base can be opened and closed, and spare shells and multi-spindles can be stored inside. In addition, the acrylic cover can be detached with a special hinge, and it can be played with the cover in multi-play.
DB-3/DCOV-3 is a standard type case and has the same dimensions and finish as DB-31, but the storage spacer is omitted.

Model Rating

Type	Record player
Turntable	30.5 cm non-magnetic die cast, 3.1 kg Fully dynamic balanced
Drive motor	Synchronous continuous pole motor
Speed	33 1/3, 45, 78 rpm
Pitch control	Each speed 6% (about half tone)
Wow and flutter	Not more than 0.06% (according to DIN45 507)
Rumble (according to DIN45500)	-42dB -63dB
Tone arm	Extra Long Pipe Arm
Tone arm support	4-point gimbal
Tracking error	1.5 degrees or less
Tone arm angle (by cartridge)	Horizontal : 0.015g or less Vertical : not more than 0.007g
Cartridge mounting	With a detachable special shell (1 ~ 12g cartridge attachable)
Needle pressure adjustment	Direct Reading Dial, 0 ~ 3g Variable (Up to 5.5g Possible)
Anti-skating	Direct-Reading Dial with Conical / Elliptical Needle
Queue control	Silicone oil dump type
Strobe light	Neon-reflecting strobe (For 33 1/3, 45 rpm)
Pwer	AC110/220V, Switch Switching 50Hz/60Hz, replacement of motor pulley
Power consumption	Approx. 10W
External dimensions	Width 376x Height 26 (Counter Weight Part) x Depth 308 mm
Weight	7.2kg
Attachment	Single play spindle Multi-play spindle 45 Rotation Donut Board Adapter
Sold Separately	Dual Case / Cover CK-20/CH-20 (¥ 27,000) Domestic Case / Cover DB-31 (¥ 5,600) / DCOV-3 (¥ 4,300) Domestic Case / Cover DB-3 (¥ 3,400) / DCOV-3 (¥ 4,300) Spare Head Shell TK-14 (¥ 1,200) Donut Multi-Play Spindle AS-12 (¥ 1,800)