NAD Electronics 5080 User's Manual
Contents
1. 5080 Turntable Date of manufacture Jan 81 Please note that this document contains the text from the original product brochure and some technical statements may now be out of date The NAD 5020A and 5080A turntables are precisely engineered products employing the best in modern materials technology They combine first class record playing performance long term reliability convenient operation and an economical purchase price THE TONE ARM In principle the job of a turntable is simple to suspend the pickup cartridge in mid air while spinning the record under it But since the record may contain groove modulations as small as a wavelength of light this job must be executed with extreme accuracy The tone arm must be stable rigid vibration free friction free and very low in inertia so as not to alter or impede the tracking of the groove by the stylus Both NAD turntables employ the same high quality tone arm It is a straight tube made of black anodised low resonance aluminum alloy selected for an optimum combination of low mass and high rigidity The open frame plug in headshell is molded from light weight resonance absorbing carbon fibre The total effective mass of the tone arm referred to the stylus tip is a mere 10 grams half that of some well known tone arms The arm pivots on jewelled bearings whose friction is only a few thousandths of a gram These features ensure agile tracking of even the most warped records and they2. guarantee that regardless of what phono cartridge you choose to use from a budget model to the most refined moving coil pickup its full performance will be realised in this arm When a pickup cartridge is installed in any pivoted tone arm the adjustment of stylus overhang is critical to ensure that the stylus will be tangent to the groove at all points on the record In the new NAD tone arm this adjustment has been made easy the cartridge carrier rides in parallel grooves in the headshell allowing the cartridge to be moved back and forth with no fear of twisting and cartridge alignment guidelines are conveniently molded into the underside of the platter mat AUTOMATIC OPERATION FRONT MOUNTED CONTROLS While you may operate the tone arm by hand if you wish a simple shift of the control lever provides fully automatic operation the platter starts rotating the arm moves to the lead in groove and lowers the stylus then at the end of the record the arm lifts and returns to its rest while the motor shuts off The cycling mechanism is made of low friction Delrin for extremely quiet smooth operation and it is completely disengaged from the arm except during cycling operations Since there are no linkages attached to the arm the convenience of automatic operation is obtained with absolutely no compromise in the arm s excellent record playing performance For still greater operating convenience the turntable controls including the cueing lever
3. RES The decorative soft rubber mat is actually an integral part of the engineering design efficiently suppressing any resonant vibrations in the metal platter The fiberglass composite base resists abrasion or wear and is supported on spring loaded large diameter rubber feet for improved resistance to vibration and acoustic feedback TURNTABLE Drive system Speeds Speed adjustment Wow and flutter Signal Noise ratio TONEARM Operation Length Effective mass Overhang Lateral tracking error Cable capacitance Remote NAD Link PHYSICAL SPECIFICATIONS Dimensions Wx H x D Net weight Shipping weight Dimensions are of unit s cabinet without attached feet add up to 18mm for total height Dimension depth excludes terminals sockets controls and buttons NAD Electronics All rights reserved E amp OE Direct drive 33 3 and 45 1 rom 3 0 10 DIN peak 68cB DIN B weighted Fully automatic Cue amp start lift amp stop at end of record 208mm pivot to stylus 10grams 17mm 0 38 170pF No No 450 x 156 x 365mm 5 5kg 7 7kg
4. for raising and lowering the arm are located along the front edge of the base plinth making it easy for you to play records with the dust cover closed PLATTER DRIVE SYSTEM In the NAD 5020A the diecast aluminum platter is driven by a vibration absorbing soft rubber belt The motor is synchronous in its operation which means that it locks onto the AC power line frequency and maintains precise rotational speed unaffected by variations in line voltage but it also contains an induction rotor to provide the high starting torque needed to get the platter up to speed The NAD 5080A is a direct drive unit the turntable s central spindle is the shaft of the motor In many early direct drive designs this approach caused high levels of infrasonic rumble because conventional electric motors deliver their power in a series of torque pulsations cogging instead of a smooth rotary flow E g with a 12 pole motor there are 12 pulsations per revolution In the NAD 5080A this problem is completely eliminated with the aid of a new coreless slotless brushless motor which exerts a constant magnetic force throughout the entire 360 degree rotation of the platter Thus the advantages of direct drive operation are fully realised with no off setting disadvantages As an added convenience a Pitch control is provided for adjusting the speed over a 6 percent range and an included strobe allows you to set the speed to exactly 33 3 or 45 rpm EXTRA FEATU
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