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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





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