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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





BIC 940 turntable

B.I.C. has been a leader in the U.S high fidelity industry since 1937 and over the years has sold and serviced hundreds of thousands of fine turntables

Out of this experience a new turntable concept evolved. Quite simply it is a Multiple Play Manual Turntable, comparable in performance with the best turntables now available, and which incorporates automatic and multiple play features without sacrificing performance. It is a belt-drive turntable - belt drive a simple, quiet, wow-free method of turning the platter and isolating it from the motor.

It incorporates a program panel which allows the turntable to be operated in 3 modes;

1-As a single-play manual

2-As a single-play automatic in which the turntable cycles and shuts off at the touch of a button and will play one selection as many as 6 times automatically

3-As a multiple-play turntable that will play as many as 6 records in sequence

The B.I.C. motor is a low-speed (300 rpm) 24-pole synchronous motor as opposed to the 1800 rpm motors found in the majority of changers and automatics today.

Other evidences of design sophistication include isomer shock mounts (instead of springs), an extremely low profile , and a feather-touch cycle button which requires anly 90 gm pressure.

 


The B.I.C. 940 , in addition to the features noted above, has a low-mass tone arm which incorporates vertical tracking force adjustment in the isolated counter weight. Anti-skating is adjusted by a knob on the program panel. The tone arm is the equal of the most sophisticated available. It will track any cartridge, CD-4 included, at the lowest setting recommended by the manufacturer. Cueing is viscous damped up and down.

Performance is comparable with other manual turntables which are much more ex[pensive. The Model 940 is designed to function with as fine a system as you choose to assemble and yet is priced modestly enough to be a logical choice for any system being put together on a strict budget.

 

The B-l-C Multiple Play Manual Turntable represents the culmination of many years of engineering design effort directed towards the development of a superior manual turntable equipped with automatic, multiple record playing facilities.

Its drive system utilizes a slow speed (300 rpm) 24 pole synchronous motor, and belt drive, previously found only in fine manual turntables. This results in significantly reduced rumble, wow and flutter since idler-pulleys are totally eliminated. The Model 940 maintains precise speed over a wide range of power line voltages, since its motor’s rotational rate is determined solely by power line frequency (50 Hz or 60 Hz).

The tonearm system features minimal friction bearings, low mass and resonance, stylus force, and tonearm balancing and an isolated counterweight to maintain optimal tracking force from the first to last record played. Another exclusive feature, a pivotable cartridge shell, permits easy cartridge installation.

The programmer system eliminates the inherent shortcomings of conventional turntables because its action is independent of erratic spindle-sensing mechanisms or dimensional variations of records. The programmer allows for totally manual play or automatic play of single records, repeat playing of single records, programmed play of up to six records, or automatic play of multiple records with programmed repeatability of the last record, all by means of a single touch button.

The suspension system has been designed to prevent mechanical or acoustic vibration coupling, thereby permitting you to take full advantage of the wide dynamic musical range now available in modern disc recordings.

 


Features:

The Model 940 is wired for 117 volts, 60 cycle operation in the United States. The unit is compatible with 50 cycle operation and can be easily converted. On the underside of all units is a code tag which lists electrical specifications. The Model 940 requires a 50 cycle pulley. This part is available through your dealer or from British Industries Co. Detailed information is supplied with each 50 cycle kit. For operation on 220 volts, contact your local dealer or service center for a suitable step-down transformer and conversion.

Cartridge Mounting Screws The Model 940 is supplied with several pairs of machine screws,

No. 3-48 American standard machine screws.

Belt The drive belt used is made to exact specifications for maximum performance. If ever a new belt is required, we highly recommend that you purchase the genuine, exact factory replacement as inferior replacement belts will seriously downgrade the performance of your unit. This is also available through your local dealer or British Industries Co.

Motor B-l-C Turntables incorporate a 24-pole, 300 rpm motor of outstanding characteristics.

The design nature of this motor insures many trouble-free hours of listening pleasure and very seldom, if ever, requires maintenance or lubrication.

Speed The Model 940 will play records recorded at 33-1/3 and 45 rpm.

Record Size Twelve inch 33-1/3 rpm records may be stacked and played automatically on the automatic spindle supplied with the unit. Seven inch 45 rpm records may be stacked and played automatically on the optional automatic 45 rpm adaptor, Stock No. A-2.

All other size 33-1/3 and 45 rpm records can, of course, be played manually.

Maximum Number of Records B-l-C Turntables accept and play up to six records automatically.

Cartridge B-l-C Turntables will accept any cartridge manufactured at the time of this writing, and will track at the lightest force recommended by cartridge manufacturer.

Cable Capacitance The total cable capacitance (all wiring) of the Model 940 is less than 125 pf and, therefore, is perfectly compatible with Discrete Four Channel records (CD-4).

 


Specifications

Tonearm:  Tubular aluminum mounted in die-cast platform

Tonearm Pivots: 

Vertical :  needle bearings pivoting in hardened ball bearing race. Friction, less than 5 mg

Horizontal :  brass shaft atop lateral ball bearing race Friction 6-8 mg

Tonearm Length:  216,2 mm (pivot to stylus)

Tracking Error:  0,35° / inch max.

Tonearm Effective Mass:  18 grams (resonance less than 9 Hz)

Counterweight:  one piece machined die-casting isolated from arm by elastomeric damper with built-in stylus force indicator

Tracking Force Range:  0 - 4 grams in .25 gm increments

Anti-skate range:  continuously variable from 0 - 4 gms in 1 gm increments

Cueing:  damped both directions

Cartridge Shell Connection:  rotated for cartridge installation

Tonearm Wiring Capacities:  less than 20 pf per channel

Motor:  24-pole 300 rpm synchronous, impedance protected

Drive:  precise ground elastomer belt

Start-up:  full speed in less than ⅓ revolution

Speeds:  33-⅓ and 45 rpm

Platter:  12" non-ferrous mechanical die-casting

Rumble (DIN):  better than -65 dB

Wow and Flutter (WRMS):  better than .05%

Program System:  can operate as single play manual, repeat single up to 6 times, or play up to 6 records automatically.

Record Support:  two points system

Shock Mounts:  4 isomer mounts

Record Size (Auto play):  7" (45 rpm) - 12" (33-⅓ rpm)

Manual Spindle:  Non-rotating - optional rotating spindle available

Audio Cable Capacitance:  less than 20 pf per foot . Compatible with CD-4

Power Requirements:  105 - 130 V AC, 60 Hz  - 50 cycle adaptability

Dimensions

B.I.C. Turntables must be mounted on the official B.I.C. B20 or WB20 bases

Unit off Base (W x H x D):  15-7/8" x 6-9/16" x 12-11/16"

Unit on Base without Dust Cover (W x H x D):  17-1/16" x 6-9/16" x 14-11/16"

Unit on Base with Dust Cover Raised (W x H x D): 17-1/16" x 7" x 14-11/16"

Weight( Shipping):  11 lbs


 

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