Beschreibung
BIC 980 turntable The BIC 980 represents a considerable design achievement. For possibly the first time, engineers have embarked on a turntable design project unhampered by preconceived notions or existing peces of hardware. As a result, each of the turntables three operation systems i tone arm, programmer, and drive are new. The Motor The 24-pole, 300 rpm motor, which power BIC turntables, differs from motors used in automatic turntables. Its low rpm and smooth flow of power tend to eliminate the instability and vibration, which create playback distortion in automatic turntables. The BIC turntable motorat spdeed of 300 rpm it does not generate the heat/friction of high revving motors, and its vibration frequencies fall below the audible range. With this low-speed motor, a larger pulley can be used, minimizing tolerance and speed variation problems presented by smaller pulleys in conventional machines. The BIC motor is a synchronous unit that locks into the AC line frequency (or to its own electronically generated reference signal in the case of the 980). The coil is completely shielded in order to keep dust and dirt may cause noise in other parts of the system The Drive System This mechanism reduces the speed of the motor shaft and transfers its turning force to the platter. Automatic turntables accomplish this through an intermediate idler wheel. BIC turntables use a belt-drive system which, until now, has been found only in fine manual and single play turntables. Solid State Electronics In the 980,speed accuracy is maintained, and variable pitch adjustment is controlled by solid state circuitry. In conventional units, pitch control is accomplished through far less stable mechanical linkages. The BIC turntable motor is a sophisticated, 24-pole synchronous unit that locks in to power line frequency rather than line voltage. While line frequency is much more stable than voltage, it is still subject to variation in extreme cases. Therefore, the BIC 980 features a solid state electronic circuit that performs two stabilizing functions. It incorporates a Wien Bridge oscillator, which generates an electronic signal that is more accurate and consistent than AC line frequency. It contains a variable speed control, which allows the user to change the pitch electronically, with perfect accuracy. Electronic circuitry is the most reliable technology for assuring perfect speed stabilization. In BIC 980, the solid state circuit board does away with mechanical pitch control linkages found in the majority of automatic turntables, which invariably deteriorate with age. Pitch Control Pitch can be varied 3% on the BIC 980. because the change is accomplished electronically, the control knob can be moved effortlessly. This eliminates the danger of jarring the machine while changing pitch and damaging the record or stylus. Illuminated Stroboscope The lighted strobe scale is fixed to the underside of the turntable and can be read easily through a window next to the control knob while a record is being played. Until now, the electronic circuitry that controls speed and pitch has been a feature of only the most sophisticated manual turntables. It has not ben available on any automatic turntable with multiple play capability. It is the one important feature distinguishing the BIC 980 from the 960. Otherwise, the two BIC turntables are identical The Tone Arm System The tone arm and all controls are designed to provide exceptional performance on the most sophisticated cartridges. They eliminate tracking force variations in multiple play - one of the major drawbacks of automatic units. They permit the user to adjust the cueing rate - a feature currently found on no other turntable. Anti-Skating and Stylus Force Adjustment Most of the leading manual and automatic players have two separate scales to adjust anti-skating - one for conical and one for elliptical styli. Often these cales are difficult to read. The anti-skate controls are generally clumsy and difficult to grasp. The mechanism that makes the anti-skate compensation is normally a single spring, with a separate scale and adjustment for tracking force; this scale may or may not be positioned in direct relationship to the anti-skate control. Ideally, both controls should be lockated side by side for convenient and precise adjustment. The tone arm is mounted on needle bearings in a precision gimbal. Atop the gimbal ring, a single calibrated scale reads out both anti-skate and stylus force adjustments.flanking the scale are two easy-to-grip, clearly legible control tab They are simple to manipulate, either one at a time or in tandem. The control lever establishing the correct setting for conical or elliptical styli is on the program panel.whenthis lever is moved to the position of the corresponding stylus type,the calibrated scale on the gimbal ring shows precise anti-skate setting. Tracking Variation When a series of records is played on a changer, tracking force may vary as much as 6 grams from first record to last. To compensate, most changers are designed so that the middle record tracks with the correct force. Single play performance becomes a vicim of this averaging. The pivotry of the BIC tone arm has been engineered to eliminate this compromise. Variation in tracking force from first to sixth record in multiple play is less than 0,1 gram. The Cartridge Shell This is a critical link in a tone arm system. The ultimate performance of sensitive new stereo and 4-channel cartridge/stylus combinations depends on it. The BIC cartridge shell can be fine-tuned for optimum tracking. No cartridge shell on any turntable has its advantages. The Program System This is a major innovation in turntable design. It gives the owner 7 possible manual and single-play automatic options. No other turntable offers such flexibility in the single play mode, yet simplifing the mechanism rather than making it more complex. Not too long ago, a single play turntable was the last word in playback performance. No changer or turntable with automatic features could stand close comparison a quality manual unit. Today, the situation has changed dramatically. BIC programmed Turntables present the most critical high-fidelity enthusiast with systems-engineered instruments that meet (and in some cases exceed) the standard set by fine manual turntables. At the same time, without any sacrifice in performance, they include some very desirable automatic capabilities. Specifications Drive System Motor:300 rpm 24-pole synchronous , impedance protected Drive: Long-life, precision ground, elastomer belt Pitch Adjustment:Electronically controlled approx. 3% Pitch Control Monitoring:built-in neon bulb lighted strobe Solid State Electronic Motor Power Supply:stable Wien Bridge oscillator driving quadrature related power amplifiers Start-Up Time:full speed in less than 1/3 of a revolution Turntable Speeds:33-1/3 and 45 rpm Turntable Plater:12-inch, non-ferrous, one-piece machined die cast, balanced turntable. Weight kinetically matched to motor and drive system Rumble (DIN):better than -65 dB Wow and Flutter: (WRMS):better than 0,05% Tone Arm System Construction:Tubular aluminum tone arm,in machined gimbals, mounted on die cst platform by means of a machined brass shaft. Pivot Arrangement: Vertical :Twin needle bearings pivoting in hardened ball bearing races Horizontal :precision ground brass shaft moving atp a lateral ball bearing race. Bearing Friction:less than 5 mg (horizontal), 5 - 8 mg (vertical) Pivot to Stylus Length:216,2 mm Lateral tracking Erroe (Max):0,35/in Effective Tone Arm mass:18 RMS Tone Arm Resonance:less than 9 Hz Tone Arm Counterweight:one piece machined die casting, with machined knurled band and elastomeric compliant resonance/isolation damper Stylus Overhang:adjustable with supplied gauge Initial 15 Vertical Tracking Angle:user adjustable by means of adjustment screw in cartridge shell to compensate for variation in cartridge height (gauge supplied with unit) Manual/Auto 15 Compensator:2-position lever in shell Stylus Track Force Range:0 - 4 gms in 0,25 gm , calibrated increments Tracking Force Accuracy: within 0,1 gm from 1st to 6th record Anti-Skating Stylus Mode Selector:lever selector for conical or elliptical types Anti-skating Adjustment Range:0 - 4 gms in 0,25 gm , calibrated increments Cueing System:Damped both directions Cueing Rate:user adjustable approx. 1 - 3 seconds Cartridge Shell:male/female 4-pin gold-plated connectors secured by locating pin and knurled locking nut Finger Lift:Stainless stell professional type Minimium Tripping Force:less than 0,15 gms Program System Number of recirds programmable:1 to 6 Playing Modes:manual; Automatic; Single; Repeat Single up to 6 times; Multiple Play up to 6 ecords Cycle Button: feather touch actuation of all automatic modes Geberal Record Size:7 and 12 inches Tone arm Wiring Capacities:less than 20 pF/channel Record Support:Reliable 2 point system, with safety support platform for automatic record handling Shock Mounts:4 elastomeric mounts, computer designed for the turntable Power Requirements:105 - 130 VAC 60 Hz , 50 Hz adaptability Shipping Weight:12 lbs
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