Dual 1229Q turntable

Motor and Pulley

Power for the turntable platter and the changing mechanism is supplied by a four—pole Dual continuous pole synchronous motor suspended by radially located elastic mounts and having a very small stray magnetic field and little vibration. The speed of the motor is independent of line voltage, temperature or load variations. Speed is dependent on, and proportional to power—line frequency. The motor is adapted to 50 or 60 cycle (Hz) power—line frequencies by the correct choice of motor pulley.

The motor pulley is fastened to the motor shaft by a setscrew. When you change pulleys, be sure that the new pulley is set at the correct height The turntable platter is driven by the idler wheel, which, to prevent damage to its friction surfaces, is automatically disengaged when the unit is shut off. Setting the turntable speed to 33 1/3, 45 or 78 rpm is done by raising or lowering the idler to bear against the proper step of the motor pulley. Upon actuation of the switch, the switch segment rotates. This causes the lever fitted into a slot on the segment to move vertically. The drive wheel carried on the swinging arm is then lifted off the motor pulley, moved and replaced on the motor pulley step corresponding to the selected speed.

Tonearm and Tonearm Bearing

Tubular tonearm, extra lightweight, torsionally rigid tonearm of the Dual 1229 Q pivots both horizontally and vertically on needle bearings and precision ball bearings in hardened and polished races. lt is suspended in a gimbal arrangement. This keeps friction to a minimum.

Vertical pivot friction = 0.007 gram

Horizontal pivot friction = 0.015 gram

referred to stylus tip

The arm is thus able to track extremely well. The tonearm head is removable. Before setting the tracking force for the cartridge being used, set the tracking—force scale to zero and balance the tonearm. Initial balance is by sliding the counterweight .Final adjustment is by turning the weight. You can balance cartridges with a weight of 1 to 10 grams.

To reduce the effects of small shock impulses on the arm, the counterbalance weight is resiliently mounted on a threaded spindle, and friction—braked to prevent accidental rotation. The cartridge holder will accept all cartridges with international standard mounting centers of 1/2 inch. Stylus force is set by turning a calibrated housing which stresses or releases a spiral spring contained inside. The scale adjustment is calibrated from 0 — 3 p, from 0 — 1.5 p at 1/10 p and from 1.5 — 3 p at 1/4 p intervals. Tracking forces of mors than 3 p can be adjusted with the help of the counter—weight on the tonearm; turning left (counter—clock—wise) increases the tracking force by 1/2 p per complete turn.

Specifications

Drive : Dual synchronous/continuous-pole motor, with radial elastic suspension

Platter:  Non-magnetic,  dynamically balanced

platter Weight:  3,1 kg

Platter Diameter:  305 mm

Platter Speeds:  33-1/2 ; 45 and 78 rpm

Pitch Control:  Range of variation, one semitone (6%), on all three speeds

Stroboscope:  For 33 1/3 and 45 rpm speeds. I Iluminated by special neon glow lamp

Speed Variation:  less than  ± 0.06% according to DIN 45 507

Noise (Measured according to DIN 45 500): 

Rumble 42 dB below standard signal 

Weighted audible rumble 63 dB below standard signal

Tonearm:  Torsionally rigid, extra-long tubular tonearm in four-point gimbal type bearing

Maximum Tracking Error:  0.16°/cm

Tonearm Bearing Friction (referred to stylus tip) 

Vertical : less than  0.007 gram

Horizontal : less than  0.015 gram

Tonearm Head (cartridge holder) :  Removable, accepts all cartridges weighing 2 to 10 grams and having standard 1/2" mounting centers

Current Type:  AC 50 or 60 cycle, with appropriate motor pulleys

Line Voltage:  110/130 V and 220/240 V selector

Power Consumption:  < 10 watt

Current Requirements

approx. 62 mA at 220 V 50 cycle

approx. 115 mA at 110 V 60 cycle

Dimensions (W x H x D): 14-3/4" x 3" x 12"

Weight:  7.2 kg unpacked

 

Dual 1228 turntable

 Motor and Drive

Power for the turntable platter and the changing mechanism is supplied by a four-pole, split-pole synchronous motor suspended by radially located elastic mounts and having a very small stray magnetic field as well as little vibration.

The speed of the motor is independent of line voltage, temperature or load variations. Speed is dependent on, and proportional to, power line frequency. The motor is adapted to 50 or 60 cycle (Hz) power line frequencies by the correct choice of the motor pulley.

The platter is driven by the idler wheel which is automatically disengaged from the motor pulley when the unit is shut off in order to protect its driving surface.

Platter speeds of 33-1/3 and 45 rpm are selected by raising or lowering the idler wheel to the appropriate step on the motor pulley.

Tonearm

The Dual 1228 has a light, torsionally rigid metal tonearm in a gimbal type suspension. The actual support is provided by four hardened and precision-polished steel points resting in precision ball bearings. Tonearm pivot friction is thus reduced to a minimum.

It therefore guarantees exceptionally good tracking characteristics. The tonearm head is removable. Before setting the correct stylus force for the particular cartridge installed in the tonearm head, the tonearm should be balanced with the stylus force setting dial at the zero position. Coarse balancing is accomplished by sliding the counterweight and using setcrew, after which a fine adjustment is made by turning the weight. The counterweight is proportioned so that cartridges with a weight of from 1 to 12 grams can be balanced. For the absorption of vibration and rapid small shocks, the counterweight is coupled to its threaded shaft through an elastic medium, and braked to prevent unintended rotation. The tonearm head accommodates all cartridges that conform to the internationally standard ½ inch mounting centers, and whose weight does not exceed 10 grams. Stylus force is set by turning apring housing, which is equipped with calibrations and which stresses or relaxes a spiral spring inside it. The scale is calibrated for a range of zero to 5 grams, and permits exact settings every 0,5 gram within that range.

Specifications

Drive:  4-pole synchronous motor

Platter:  Non-magnetic

platter Weight:  1,4 kg

Platter Diameter:  270 cm (10,5 inch)

Platter Speeds:  33-1/2 and 45 rpm, automatic tonearm setdown coupled to speed selector

Pitch Control:  Adjustment of approx. 1 semi-tone (6%) at both platter speeds

Speed Check:  with light stroboscope for platter speed of 33-1/3 and 45 rpm adjustable for 50 or 60 Hz

Wow and Flutter:  less than  ±0,00 % rated in accordance with DIN 45 507

Signal-to-Noise-Ratio:  (in accordance with DIN 45 500)

Better than  58 dB at rumble s/n

Better than 39 dB at rumble unweight ted s/n

Tonearm :  Torsion resistant, aluminum tonearm in universal four-point gimbal suspension

Tonearm Bearing Friction

Vertical :  <  0,008 p

Horizontal :  less than 0,18 p

Pick-up Head (Cartridge Holder):  Removable, suitable for acceptance of all cartridges having ½” mounting and a deadweight of 2 – 8 gram (including mounting fixtures)

Stylus Pressure:  Continuously-adjustable from 0 – 10 p, reliable as from 0,5 p stylus pressure

Current Type:  AC 50 or 60 cycle, with appropriate motor pulleys

Line Voltage:  110/130 V and 220/240 V selector

Power Consumption:  less than  10 watt

Current Requirements

approx. 64 mA at 220 V 50 cycle

approx. 115 mA at 110 V 60 cycle

Dimensions (W x H x D):  13" x 5" x 10-3/4"

Weight:  4,3 kg

Lenco L78 turntable

The new Lenco L78 is a further development of the proven L75 and can be counted amongst the top rank of transcription quality turntable units. All the requirements of DIN 45500 are exceeded and the technical innovations increase the sound quality and also simplify the operation of the unit.

The drive through the 4-pole motor and the conical spindle allows for infinitely variable speed adjustment. The pick-up arm, which can be balanced out in every plane, has low inertia and a friction-free movement through its knife edged bearings and adjustable stylus pressure from 0,5-5 grams and assures faultless reproduction with minimum record wear. The pick-up arm is raised from the record automatically at the end of play. The chassis is fitted with four viscously damped mounting springs which can be adjusted for levelling the unit. Due to a built-in friction the hinged dust cover of the L78 will stay open in any position down to 20°

 

Features

The Lenco L 78 Record player is a precision instrument of true Hi-Fi quality which will satisfy even the most demanding music lover.

The instrument can be used for stereo as well as monophonic listening.

The usual speeds of 16%/s, 33'/s, 45 and 78 RPM can be pre-set in click-stops and the speed can also be varied continuously from 30—86 RPM.

The light tonearm of the L 78 is a first-class example of fine mechanical precision, and guarantees clear, undistorted sound reproduction, with the greatest possible protection for your records. The tonearm is lowered onto the record by a hydraulically damped lowering device — thereby eliminating the possibility of record or needles being damaged whilst putting the tonearm onto the record.

The unit is SEV, DEMKO, NEMKO, SEMKO and CSA tested and approved.

 

 

Technical Description

The very silent 4-pole motor (44) is spring mounted onto a rigid steel baseplate. The dynamically balanced turntable is made of die-cast zinc, and weighs 4 kg.

The power is transmitted from the conical motor shaft (43) to the turntable by a rubber covered idler wheel (41). The speed is changed by moving the idler wheel on the motor shaft.

The miniature ball-bearings fitted into the tonearm allow for a free sideways movement, and the knifeedge bearing keeps friction to a minimum.

An adjustable sliding weight (5) enables one to set the stylus pressure exactly to suit the cartridge being used. An automatic brake (23) comes into operation when the turntable is switched off.

All tonearms can be supplied with the anti-skating device (3, 28, 29).

Every L78 Is supplied with a centre piece for records with a large centre hole, a stroboscope disc for exact setting of speed, a stylus-adjusting gauge for accurate setting of stylus overhang, a set of shock-absorbing mounting supports anda cut out template (only required for chassis model).

 

Specifications

Shut-oof Switch

The L78 features a new mechanical shut-off which switches off the unit and raises the pick-up arm at the end of the record. This shut-off mechanism can be disconnected if not required, for example for language courses, by turning the knob to "manual"

Motor:  4-pole motor with conical spindle

Speeds:

Turntable speed infinitely variable between 30 and 86 rpm with locations for:  16-2/3, 33-⅓, 45 and 78 rpm

Wow and Flutter:  ±0,11% (±0,06% weighted to DIN 45507)

Hum Level for magnetic cartridges:  -60 dB

Rumble Weighted (DIN 45539):  -60 dB

Speed change for a 10% change in main voltage :  ±0,2%

Maximum deviation of speed using a cartridge tracking at 6 p 0,3%

Pick-up Arm

Pick-up arm with counterweight, with knife-edged bearings

Adjustable stylus pressure from 0,5-5 g

Removable plug-in shell of light metal to accommodate all pick-up cartridges

Total Length of Arm:  314 mm

Tracking distance between vertical spindle and turntable spindle:  210 mm

Stylus Overhang:  17,1 mm

Adjustment for Stylus Position:  12 mm

Tracking Angel:  23° 12'

Tracking Error wit correct setting for stylus:  ±0,8°

General: 

Dynamically balanced turntable

Hydraulically damped lowering arm for pick-up

Viscously damped mounting springs

Power Requirements:  110 V, 220 V at 50 Hz (switchable) and 110 V at 60 Hz

Dimensions

Baseplate of 2 mm thick steel :  385 x 330 mm

Height required above baseplate :  55 mm

Depth required below baseplate :  75 mm

Turntable diameter :  312 mm

Weights

Balanced die-cast zinc turntable :  4 kg

Total weight of chassis :  8,5 kg

Total weight of chassis with packing :  10,5 kg

Total weight with plinth and cover :  12,00 kg

Total weight with plinth and cover and packing :  15,2 kg

 

Lenco B52 turntable

Features

The Lenco B 52 record player is a precision unit of true Hi-Fi quality which will satisfy even the most demanding of music lovers

The instrument can be used for stereo as well as monaural listening

The speed can be set at the usual click-in stops of 16-2/3, 33-⅓, 45 and 78 rpm, and additionally can be adjusted continuously from 30 to 86 rpm

The light tonearm of the B52 is a first class feat of fine mechanical precision, and guarantees a clear, undistorted sound reproduction, with the greatest possible protection for your records. The tonearm is lowered onto the record by the operating a semi-automatic hand-switch, which eliminates the possibility of records or needles being damaged whilst putting the tonearm onto the record.

The unit is SEV, DEMKO, NEMKO, SEMKO and CSA tested and approved.

 

Technical Description

The very silent 4-pole motor (20) is spring mounted onto a rigid sheet steel baseplate. The 2mm thick, heavy sheet steel turntable rests on a conical shaped spindle which lies in an elongated bearing armature with steel bearings.

The power is transmitted from the conical axle to the turntable by the rubber covered idler wheel.

The change of speeds is brought about by moving the idler-wheel on the motor axle.

The miniature ball-bearings fitted into the tonearm allows for a free sidewards movement, and the knife edge balance allows an amount of free vertical movement with the minimum amount of friction.

An adjustable sliding weight enables one to set the Pressure weight exactly to suit the cartridge being used, as well as to balance the tonearm statically.

Every B 52 is supplied with a centre piece for records with a large centre hole, a stroboscope disc for exact setting of the speed, a needle regulating gauge for setting the pick-up system, a set of shock mount supports and a build-in template (only required for chassis model)

 

 

Elac Miracord 50H mkII turntable

At first glance, most automatic changers seem pretty much the same. A record drops, the turntable spins, a tone arm moves over to the record, where a stylus ( or needle) drops into the grooves. This sets off a chain of electronic impulses that ends up as music from your speakers. Any automatic changer will do all this.

An Elac Miracord will do it better. Every step of the way. Result; a fuller, richer sound from your records. In very simple terms, here's how we do it:

Start with the Elac tone arm. Its job is to hold the cartridge (which holds the stylus) and swing out onto the record. Most tone arms will do just that. The ones we build do just a litle more.

 to begin with, there's the tracking force. This is technical talk for the amount of pressure the tone arm brings down on your records. Naturally, the lighter the pressure, the lower the friction - and the more plays you'll get from each record and each stylus. That's why at  the base of the Elac tone arm you'll find a special little knob that lets you adjust the weight coming down on your records to less than one gram - or one twenty-eight of an ounce.

How many times have you tried to play a specific cut on an LP and dropped the tone arm either past the beginning of the tune either past the beginning of the tune you want, or into the ending of the song before it.

 

That can be hard on your ears, and even harder on your records. That's why we've come up with a cueing device so foolproof you can literally pick any groove on a record and ease the needle into it. Just flip a lever which gently raises the tone arm and lets it float with the stylus a hair's breadth over the record. Position the arm exactly where you want it, and flip the lever back. This operates a cleverly-designed, tiny piston which softly lowers the needle into the gtoove you've selected.

Which brings us to yet another example of Elac wizardry. The natural inclination for a needle on a record is to wear against the inside wall of each groove, (if you've ever heard a stereo record where the separation seems poor or the sound is distorted, this could well be the cause), Elac eliminates this inward drag with a special anti-skate device.

All Elac changers have push-button controls, positioned where they;re easiest to reach.

Everything is controlled by push-buttons, including the heavy-duty motor. Bearings are precision-made so you can forget about the annoyance of rumble and flutter. And life-time lubricants help keep maintenance to the barest minimum.

Everything we've mentioned so far is on every Elac Miracord. An impressive set of credits, to be sure. For some models, however like the 50H mkII its just the beginning.

 

Quite simply, the best automatic turntable money will buy. The 50H mkII contains a set of advantages that places it beyond the reach of any other charger in the world. With the variable speed control you can set the speed at precisely 33-⅓ or precisely 45 rpm, and a stroboscopic ring on the turntable will read out the accuracy of the speed. You may vary the speed by as much as three per cent either way. This not only assures you of exact control for normal listening, but also comes in handy for special uses such as dubbing sound home movies, or playing along with a musical instrument, where precise pitch is essential.

The 50H mkII is also a rarity in that you can now play your finest records and the precision arm will be lowered by the silicon damped cueing device, even in the automatic phase. A newly developed synchronous hysteresis motor reduces rumble to  an all-time low while maintaining a speed accuracy that is truly incredible. All told, the Elac Miracord 50H mkII represents the ultimate in automatic changers but to fully appreciate everything it offers you've really got to hear it for yourself.

 

Specifications

Operating Modes:  Changer, Automatic

Speeds: 33-⅓ and 45 rpm

Platter:  302 mm Zinc-alloy 2,3 kg

Wow and flutter: better than 43 dB

Rumble:  better than 63 dB, single and permanent player

Fine Speed Adjustment : around 6%

Drive Type: Hysteresis motor and friction wheel drive for the turntable

Tonearm:  204 mm Metalite

Dimensions (W x H x D):  435 x 175 x 350 mm

 

Garrard X-10 turntable

 

At a teen tribal stomp, or an after dinner-party dance, the Garrard X-10 Module is the "partying kind". At the drop of a record, it is off-and-away for hours of carefree music reproduction of the highest quality. And except for an occasional fly-by to change a stack of records, it requires little or no attention. What is more, it is stil fresh for a bit of nightcap music after the last stroggler has left.

What gives it its stamina for precision performance anywhere it's called upon to play. The solid Garrard components that have gone into it, from the high torque "Induction-Surge" motor driving its oversize turntable to the meticulously balanced low-mass tubular aluminum tonearm. And for all of this, the X-10 is a joy to operate. Two simple levers to set the correct speed, record size, manual or automatic play. A unique over-arm that stead es as many as eight records for automatic play and swing out of the way for unimpeded single record play.

Separate automatic and manual spindles. A pre-installed forst quality stereo ceramic cartridge set for correct stylus pressure and accurate tracking, a fine high-compliance flip-over diamond stylus, and to better serve those "Play it again, Sam" types and preserve the records as well - a single lever control for easy cueing and pausing. This feature-filled complete record playing source comes pre-assembled on a coordinated slimline base with three-position dust cover

 

Specifications

Speeds:  33-⅓, 45, and 78 rpm

Power Source:  110 volts 60 cycles AC (50 cycle pulley available)

Dimensions (W x H x D)) 15-1/4" x 8" x 16"

Garrard X-11 "Demi" turntable

 

People in tight quarters, dorms or dens, pads or playrooms, are "spaced out" by the big sound of the compact Garrard X-11 "Demi". This fine space-saving machine packs more record playing capability than many a full scale turntable. Plays all size records at all speeds. Stacks up to eight records for smooth automatic play, steadied by a convenient swing-away overarm. And can even play a single manually or automatically. It has a tonearm rest that locks and unlocks automatically, and shut-oof is automatic too.

 

And is it ever built. Solid yet lightweight, it can take the kind of casual treatment to be expected in swinging quarters. The changer is virtually foolproof, cannot malfunction during cycling. The same goes for the high quality Garrard drive motor, you can count on it to run smooth and silent hour after hour, year after year with no special pampering.

Then there are all the ear-filling quality features that don't always meet the eye. The advanced design, low mass tubular aluminum tonearm so precisely balanced it follows the wildest groove like an angel. A first quality stereo ceramic cartridge with flip over diamond stylus, pressure adjusted for smooth distortion-free tracking.

And even if iti is small enough to tuck away in some convenient niche, Garrard has not stinted on its beauty. An ebony turntable on a green unit plate set off by en ebony pinseal base with sparkling silver trim and tinted styrene cover. It will glow from its hiding place.

 

A complete stereo record playing unit

Plays 4 speeds (33, 45, 78 and 16 rpm)

Plays all-record sizes (7", 10", 12")

Strong lightweight turntable

Separate spindles (short and long) for manual and automatic operation

Powerful Garrard-built induction motor

Prematched top quality name-brand ceramic cartridge

Flip-over long-life diamond stylus

Lightweight tubular aluminum tonearm

Convenient overarm stabilizer for stack of records swings away for manual play

Automatic tonearm lock

Automatic shut-off

Complete with injection molded base and sparkling dust cover

Completely wired; plugs into wall outlet and plays through any unit with phono input jack

Power supply at 110 volts 60 cycles AC (50 cycle pulley available)

Dimensions ((W x H x D)) 13-3/8" x 6-1/2" x 10-1/4"

 

Leak Delta Turntable

It is important that the turntable in your high-fidelity system should be specifically designed to complement in performance and appearance the other components in your system. To this end we worked with one of Switzerland's foremost turntable specialists to create the Leak Turntable.

It is a dynamically balanced turntable which weighs over half a stone, eliminating the distortions that occur in lighter turntables due to internal vibrations.

The chromium plated pick-up arm is so sensitive that it can be affected by the infinitesimally centrifugal force it creates as it moves towards the centre of the record. We compensate for this with a bias compensator utilising a minute counterbalance supported on nylon thread. The turntable also has a viscously damped pick-up cueing device. In spite of this precision the Leak turntable is, like all the finest machines, simple to operate and maintain. The speed of the turntable is infinitely variable between 30 rpm and 86 rpm.

The very silent 4-pole motor is spring mounted onto a rigid steel baseplate. The power is transmitted from the conical motor shaft to the turntable by a ruber covered idler wheel. The speed is changed by moving the idler wheel on the motor shaft.

 

Specifications:

System:  Idler drive

Turntabel Type:  Dynamically balanced turntable. Viscously damped pick-up lowering device. Speed adjustment infinitely variable between 30 and 86 rpm.

Wow and Flutter:  0,06%, according to DIN Specifications

Rumble:  -60 dB, measured in according to DIN Specifications

Speed variations:  for a 10% change in mains voltage ±0,2%.

Maximum Speed Variation:  0,3%,  when loaded by a pick-up playimg at 6 grams

Motor:  4-pole constant valocity motor with conical rotor spindle

Pick-up Arm:  Arm with counter balanced weight.

Bearings:  Knife-edge bearings

Stylus Pressure:  adjustable from 0,5 to 5 grams with calibrated sliding weight

Minimum Stylus Pressure:  0,5 grams

Headshell:  Removable lightweight pick-up headsell

Cartrdige:  Shure magnetic M75B type 2

Stylus Overhang:  17 mm (0,675")

Stylus Position Adjustment:  13 mm (0,5")

Offset Angle:  23° 12'

Tracking Error:  ±0,8

Platter:  Die-cast zinc

Truntable Platter Weight:  4 kg (8,8 lb)

Power Requirements:  AC mains 200 - 240 V, 50 Hz

Power Consumption:  14 VA

Dimensions (W x H x D):  400 x 166 x 371 mm (16" x 6,6" x 14,8")

Weight:  8,5 kg (18,7 lbs)

Finish:  Teak

Elac PC-830 turntable

Getting back to basics

For all its seeming complexity, there are really only three basic requirements of any well designed turntable:

That the turntable platter rotate at a constant unvarying speed

The the tone arm enable the cartridge to trace the microscopic undulations in the record groove freely and accurately

That it be extremely reliable and trouble free.

The turntable proper

Let us examine the turntable mechanism first. In addition to rotating at an exact speed, a well designed turntable should be able to play a record with:

Minimum rumble - that is, it should not contribute any mechanical noise of its own to the music.

It should have undetectable wow and flutter. That means it must be free of slow and fast variations in pitch caused by momentary variations in speed.

Belt drive plus.

The primary cause of turntable rumble is the transmission of vibrations from the drive motor to the tone arm as it tracks the record.

Over the years, various methods have been devised to reduce rumble. Perhaps the simplest, most affective and reliable is the use of a belt drive system. By connecting an elastic belt from the drive shaft of the motor to the rim of the turntable platter, while the belt acts as a very effective mechanical filter damping out motor vibrations.

However, there is one drawback to this otherwise admirable system. It lacks sufficient torque or start up power to actuate the arm lifting and cycling functions quickly and efficiently.

To remedy this problem, Elac has designed an ingenious drive system with an idler assist called Belt Drive Plus, which is incorporated in the new Elac PC 830.

An idle wheel driven directly by the motor brings the platter up to speed quickly and indexes the arm over the lead-in groove of the record. As soon as the tone arm descends and the stylus touches the record, the idler is disengaged end the turntable operates in the belt drive mode only.

To reduce wow and flutter, the Elac PC 830 couples the motor to a heavy (4:4 pounds), dynamically balanced turntable platter. The mass of the platter in rotation creates a flywheel effect and very effectively smoothes out any momentary speed variations.

It's worth noting that the flat, precision ground rubber drive belt used in the Elac PC 830 is resistant to heat and humidity. Moreover, long term dimensional stability is insured through the use of an automatic belt release that reduces tension on the drive belt when the turntable is not in use.

Precise and continous speed monitoring is provided for via an illuminated strobe and a pitch control that is adjustable over a range of ±3% of nominal speed.

In addition, the Elac PC 830 satisfies another vital, but often overlooked, requirement of a well designed turntable. It incorporates a dual element, tuned suspension system that provides maximum isolation from external vibrations, thus rendering it virtually immune to acoustic feedback as well  as other sound bluring sources.

 The well behaved tone arm

Just as a well designed turntable should do nothing more than rotate silently at a precise, unvarying speed, so should the tone arm assume a completely bening role. Its only function, to present the cartridge to the record without let or hindrance.

But this is more easily said than done. For today's better cartridges play at such very low tracking forces, often 1 gram or less, that many tone arms are hard pressed to cope with them. As a result performance can be seriously degraded.

To operate properly at these very low tracking forces, a tone arm must be very light and rigid. In addition, it should have a very low moment of inertia, so as not to impede the movement of the stylus in the groove. But that's only the begining, a well designed tone arm should also have:

Very low mass, especially at the head where it counts most.

Very low tracking error. That is, its design geometry should permit it to remain as nearly tangent to the groove as possible, at any point on the record.

Skating or side thrust compensation to keep the stylus centered in the groove.

The ability to function properly with a wide veriety of cartridges

A cueing control for simple and precise manual operation

To successfully meet all these requirements. Elac has designed a superb new tone arm for the PC 830.

Special alloy, tubular construction makes it very light and rigid while significantly reducing mass. Freedom of movement has been optimized through the use of microprecision ball bearing races in both the vertical and horizontal pivos enabling the tone arm to perform faultlessly with most lightweight, high compliance cartridges.

To provide greater stability and further improve tracking, the tone arm is dynamically balanced which has the added advantage of making turntable leveling non-critical. The offset angle (geometry) of the head minimizes tracking error and a positive contact, slide-in cartridge mount permits precise adjustment of stylus overhang to further reduce distortion.

To insure perfect centering of the stylus, in the groove at any point on the record, a highly effective antiskating adjustment is provide for conical elliptical and CD-4 styli. Thus uneven groove wear and distortion are materially reduced. A viscous damped cueing  control sets the tone arm down gently anywhere on the record. And the same gentle lowering  action also comes into play during automatic operation.

The finishing touch

In the final analysis, however, any first rank turntable is more than a collection of features. It is a study in human engineering. It should respond instantly and effortlessly. It should enable you to play a single record or a batch of records whit a minimum of fuss and bother. In short, it should never get between you and the music .

 

Specifications

Drive System:  Precision ground belt plus idler assist

Operational Mode:  Single and multiple play

Speeds:  33-⅓ and 45 rpm

Speed Adjustment:  ±3%

Wow and Flutter (DIN) ±0,6%

Rumble DIN

Unweighted ;  better than 44 dB

Weighted :  64 dB

Tone arm: 205 mm tubular alloy

Tracking Error:  less than ±1,4 degrees

Tracking Force Adjustment:  0,5 - 4 grams

Platter:  285 mm diameter zink diecast

Platter Weigth:  4,4 pounds

Power Requirements:

Power Consumption:  15 watts

Dimensions (W x H x D):  435 x 175 x 350 mm

BSR McDonald 810

The BSR McDonal 810 Transcription Series is available as a Total Turntable that includes a matching custom walnut wood base, a deluxe tinted dust cover, and rhe superb Shure M-91ED magnetic cartridge with elliptical diamond stylus. All in one carton. All included in the price. Complete, ready to plug in and play, with all critical adjustments precisely pre-set on BSR laboratory equipment.

The BSR 810 was designed without compromising quality, technical specifications or performance features - regardless of the ultimate cost. Yet, the result is an instrument offered at a price consistent with our reputation for producing turntables that are unsurpassed values in every price range.

Features:

Sequential Cam System

Replaces the conventional cam gear and swinging plate used in every other automatic turntable. This revolutionary engineering breakthrough results in a smoothness and quietness of operation and an overall reliability never before achieved. The utilization of eight independent pre-programmed cams eliminates the multiplicity of light stampings and noisy moving parts required in all other automatic turntable mechanisms.

Synchronous Power Unit

As one of the world's largest designers and manufactturers of subfractional horsepower motors, BSR set its resources to develop a motor to match the performance of the Sequential Cam System. The result is the new high torque ultra-quiet synchronous induction power unit, which achieves an unwavering constancy of speed indepemdent of voltage input or record load.

Transcription Tone Arm System

The longer the tone arm the less the tracking error. The 8,6562" pivot-to-stylus lenght reduces tracking error to less than 0,5° per inch. The low-mass aluminum tone arm assures extremely low resonance and is counterbalanced in both horizontal and vertical planes.

Concentric Gimbal Arm Mount

Gyroscopically pivoted on four pre-loaded ball-bearing races to assure virtually no friction in either the horizontal or vertical planes. This design gives the 810 a tracking capability of 1/4 gram.

Viscous-Damped Cue and Pause Control

Provides gentle silicone oil-damped tone arm descent. In all other automatic turntables, the anti-skate system tends to move the tone arm outwards while it descends. BSR designed an exclusive positive friction Cue-Clutch that prevents this. After a pause, the 810's tone arm returns to the identical groove, every time. The cueing control can be operated in both automatic and manual modes.

Viscous-Damped Tone Arm Descent

The same gentle viscous controlled descent provided in the cueing operation also functions during automatic and semi-automatic play.

BSR makes more automatic turntables than any other manufacturer. More in fact than all other manufacturers in the world put together. But of all the turntables we make, the BSR McDonald 810 Transcription Series is the most unique. It is a triumph of years of painstaking efforts and research in our Engineering laboratories in Warley, Worcestershire, England.

Our enigineers sey out with a single objective. To design an automatic turntable that could effectively offer advantages in performance and features over the finest competitive units made. We sincerely believe our 810 equals, and in many instances exceeds, the performance of any automatic turntable presently available.

 The 810 offers an impressive group of technical innovations for serious music lovers … for collectors of sophisticated high fidelity equipment. Its pre-programmed sequential cam system introduces a new experience in smoothness, quietness and featherlight operation over the widest range of operating modes. The low mass transcription tone arm system virtually eliminates tracking error and offers precise zero balance adjustment over the full range of cartridge and stylus masses. These and the other important engineering features described in this post result in complete freedom from distortion and maximum preservation of your records.

Specifications

Wow and Flutter (measured on Gaumont Kalee Wow and Flutter Meter type 1740 using Decca LXT5346 record):

Waw at 33-1/3 and 45 RPM :  less than ,1% rms

Flutter at 33-1/3 and 45 RPM :  less than ,05% rms

Wow and Flutter DIN weighted (measured on a ME102B Mini Flux meter manufactured by Technisch-Physikalisches laboratorium):

Wow/Flutter :  ±0,15 peak

Rumble :  less than 55 dB relative to a 1 kHz 10 cm/sec peak recorded signal (record to DIN 455544). The weight curve having a roll off of 12 dB per octave above and below 315 Hz

Tracking Error:  less than 0,5° per inch of redius

Arm Pivot to Stylus Distance:  8,562"

Arm Type:  Concentric gimbal arm mount gyroscopically pivoted on 4 pre-loaded ball-bearing races

Minimum Tracking Force:  1/4 gram

Arm resonance:  7 cycles

Stylus pressure Range:  0- 4 grams

Turntable Platter:  12" Dynamically Balanced die-cast, weight approx. 7 pounds

Motor Type:  Dual range synchronous power unit 100-130 V AC 60 Hz easily convertible to 220 V AC 50 Hz operation

Speeds:  33-1/3 and 45 RPM

Pitch Control: Variable ±3%

Platter Diameter:  12"

Platter Weight:  approx. 7 lbs

Drive Mechanism:  Sequential cam system

Suspension System:  Four foam damped helically wound coils on rubber shock mounts

Record Sizes:  12" 10" or 7"

Record Stack:  6 records

Muting Switch:  provided

Pop Filter:  provided

Dimensiond (W x H x D): 

810 Turntable:  15-1/8" x 4-1/2" x 12-1/8"

With  base and dust cover :  17-1/8" x 9-1/4" x 15"

Weight:

Only 810 :  17 lbs

With base and dust cover :  22 lbs

DUAL 1010 A

Auto/Standard Turntable for single play and changer operation.

The ingenious design of the top/mounting spring screws makes it possible for you to mount and secure the Dual 1010 to its base - or to the cutout mounting board of a console -  entirely from the top. No need to fumble underneath, nor to take anything apart.

The Dual 10101 tonearm is designed for tracking at the low stylus forces required by high compliance cartridges. Once adjusted for your cartridge, the force will remain highly linear for a complete stack of records. Stsylus force is adjusted by turning the knob located at the pivot; clockwise to increase force, counterclockwise to reduce force. The range of adjustment is from 2 to 7 grams, with clock stops at 1/2 gram increments.

The tonearm has been set to descend accurately into the lead-in groove. But if the dimensions of your cartridge and/or the location of its stylus cause the lattere to touch the record either too far in or too far out, it can be adjusted quite easily.

All the operations of the Dual 1010 are activated by smoothly acting slide switches. Unlike push buttons, they do not jar the spring-mounted chassis or induce even momentary vibration. Thus the three spring-mounted footings of the Dual can enjoy a softer, more shock-absorbent characteristic, rather than a compromised stiffness.

A -                    SPEED CHANGE KNOB

B -        SPEED CHANGE LEVER ASS'Y

C -                            SWITCH SEGMENT

D -                                 SUPPORT ASS'Y

E - DRIVE WHEEL TENSION SPRING

F -                                    ROCKER ASS'Y

G -                   LEVER AND STUD ASS'Y

H -                         DRIVE WHEEL ASS'Y

I -             MOTOR PULLEY 50 or 60 Hz

J -     STATOR 110 / 150 / 220 V ASS'Y

K -                           SWITCH ARM ASS'Y

L -  MOTOR ASS'Y 110 / 150 / 220 V  

                          (LESS MOTOR PULLEY)

Specifications:

Line Voltage:  selector for 110, 150 or 220 volts

Line Frequency:  50 or 60 ha with appropriate motor pulleys

Drive:  two-pole, single-phase, induction motor

System:   Idler whell drive

Wow and Flutter: 

with 8-1/2"  turntable, max. ±0,25%;

with 11" turntable , max. ±017%

Turntable Speed:  78, 45, 33-1/3 and 16-2/3 rpm

Signal-to-Noise Ratio:  at 100 cps better than 42 dB; at 250 cps better than 50 dB

Pickup Cartridge:  tonearm will accept all crystal and ceramic cartridges with 1/2" mounting.

Standard is stereo crystal cartridge CDS 620/4/45

Dimensions (W x D):  329 x 274 mm

Weight:

With 8-1/2" turntable :  8 lbs

With 11" turntable  :  9 lbs

Power Consumption:  6,5 watts approximately

DUAL 1010 F

 DUAL 1010 F 

The Dual 1010 F in all the functions is similar like model 1010 A, but  in addition is equipped in function of variable speed control.

Pitch Control - each of the 3 standard records speeds (33-1/3, 45 and 78 rpm) may be varied up to 6% by means of pitch control. The selected speed may be checked using the stroboscopic disc supplied with the unit.

How to use?

Place the stroboscopic disc on the rotating platter. Under AG illumination, the circular line patern for the desired speed will appear stationary - while the record is turning - when the actual platter speed matches the desired speed. The pitch control knob serves for making the exact adjustment.

Also the 1010F is equipped with Dual Stereo crystal cartridge CDS 630, duplo sapphire needle.