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Turntable motor with speed controller

Motor:

Synchronous Crouzet motor mounted to bronze body and stainless steel housing.

Controller:

Allows for 33 1/3 and 45 rpm speed change and fine tuning of each speed. Generate two phase signal for synchronous motor. Mains transformer is in separate stainless steel housing and turns on remotely. This design was chosen to allow place controller into S1 Starling turntable. Controller can be made of conventional design in one case.

Specifications:

Motor speed 250 rpm ( 33,3 rpm), 338 rpm (45 rpm)

Speed variation 0,08%

Fine turning of speed ± 5%

Motor weight 3 kg

Motor dimensions Ø 100, h 100 mm.

Clamp made as a sandwich of two plates of 5 mm brass and one 30 mm granite Matrix Anticato. This stone was formed in gelling of lava, and has laminated structure. It results its specific acoustic features.
There is a internal chamber inside of clamp. It filled with tungsten powder. Weight of clamp depends on quantity of powder and can be from 620 to 1000 g. Powder is material , free of own mechanical resonances, very well damped oscilations of objects to which it comes into contact.
Unit of three acoustically very different materials – metal, stone and powder and construction of clamp make a good damping effect.This effect increased because of shape of clamp.
Influence on the sound of turntable is of course subjective matter, some of audiophiles notice bass improvement, better ataque, bass become tighter, others defined improwed dynamics, smooth mid range and high frequency response, less distortion.
This heavy turntable center weight is suitable for heavy duty turntables with strong platter dryve system.
Diameter:      90mm
Height:          45 mm
Weight:         960 g

 
Welcome to the Frontpage
About Myself Print

I am a radio engineer and have worked in acoustics since 1976 after graduating from a Kaunas Polytechnic Institute. From 1976 to 2000 I worked in the ultrasound laboratory of this institute and was involved in acoustic testing of substances and the design of acoustic measurement devices. I hold, along with my colleagues from the institute, five patents in this domain. Despite being a radio engineer, I've always been interested in precision mechanics and had, for all those years held a passion for the design audio equipment; among the devices I created during that period was a turntable with record changer, which was presented in the USSR’s largest technical achievement exhibition held in Moscow. In 2007 I decided to start designing turntables and to concentrate all efforts only in this area. Why turntables? Because the High-end turntable is a device that brings together all my favorite areas – electronics, precision mechanics, design and Music (for many years I played the saxophone in an orchestra).
 
About Turntables Print

My turntables are made from high quality materials - stainless steel, bronze, brass, granite, specific wood, processed using the latest technology - cnc machining, plasma coating and other. The selection of all technical solutions is based on the given acoustic requirements. Serious consideration is given to the appearance of the turntable, as a good-sounding turntable must be also be a good-looking object in the user's home.

Basic concept of design:

A very heavy table utilizing spherical rubber dampers to support a heavy sub-chassis. The sub-chassis carries a heavy platter as well as the tonearm. This assembly (the tonearm,platter and sub-chassis) constitute a single, independent structure, floating on spherical dampers. Connections between parts of assembly are not very rigid, are demped to avoid resonances  parts of construction. Proper resonance frequency of all construction selected using rubber dampers with necessary elasticity. A low-power but extremely stable synchronous motor is located on the table and drives the platter via a belt.

I do not produce turntables in series. Because each turntable produced individually,I can to realize all your requests. You can choose: material of table- wood or stone; if stone-black or white granite; platter- of brass or stainless steel; sub shassis type; legs- long or short; number of tonearms- one, two, or more. Obviously, all these changes are made maintaining all the acoustic requirements, while listening sound of turntable, because sound is more important than design.


Core parts of turntables:

1. Stand:

The Stork and Dalia turntables have stands with legs. The legs are made of stainless steel tubes, filled with acoustic damping material. The stands can be leveled by tuning the spiked feet of each leg. The legs support a 60mm (Dalia) or 40mm (Stork) thick table, measuring 470x 470mm and made from granite or wood (see the D1 turntable). The lower part of the legs is combined 30mm (Dalia) or 20mm (Stork) thick granite panel. The foot spikes sit on flat pads.

2. Sub-frame and damping:

D-Type suspension: A triangular sub-frame is used. This structure is made from stainless steel tube which is then filled with an acoustic damping material; this assembly rests on spherical elastic dampers which in turn rest on machined bronze supports. The height of each support can be adjusted to level the platter. The dampers themselves, being spherical, absorb shock from all sides equally. Dampers of varying elasticity are available and are easily replaced.

3. Sub-chassis:

D-Type suspension: The sub-frame supports the sub-chassis, which is made of marble. Marble was chosen because for its good acoustic and mechanical properties. A socket in the center of the sub-chassis locates the platter bearing. The sub-chassis weighs 12 kg.

S-Type suspension: The sub-frame and sub-chassis are changed to one plate- type sub-chassis , made of granite Matrix Anticato. This naturally occurring composite stone was formed during the setting of molten lava, and has a laminate structure; it is well suited to the damping of ambient vibrations. Dampers, as in other turntables, isolate the sub-chassis. The plate-type sub-chassis (see S2 Black Stork) can accommodate two or three tonearms.

4. Bearing:

The bearing uses a 9mm. steel shaft within a steel sleeve. The outer surface of the shaft and inner surface of the sleeve are precisely polished. The shaft is terminated in the form of a half sphere, and rests on a polished ceramic plate. The assembly is located in a 35mm diameter stainless steel housing that is filled with oil.

5. Motor:

The platter is driven by a low-speed (250 rpm) synchronous Crouzet motor, mounted to 5 a kg bronze body in a stainless steel housing.

6. Platter:

The platter measures 320mm in diameter, weights about 10 kg and is located on a conical axle; it is thus easily removable without disassembly of the bearing. The platter can be made in two ways:

Option 1: A stainless steel platter made from 12mm plate, with a 4mm x 40mm strip welding to its perimeter. The outer surface is then plasma- coated with bronze and an vibration-suppressing material is applied to the inner (under) surface.

Option 2: A sandwich laminate made from three 5mm-thick brass plates and one 10mm-thick acrylic plate.
 

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