![]() This is to overcome the friction caused when the stylus is in contact with the record groove. When reassembled, the turntable should now run very slightly fast. I actually use HP (high pressure differential) oil instead of grease on the main platter bearing and also use HP oil on the platter shaft, as it reduces bearing noise and rumble by preventing metal to metal contact. Use a tiny drop of the same light oil on the idler wheel shaft. 33 1/3 and 45 rpm can be checked during play with the aid of the stroboscope. The idler wheel may need to be treated with 'rubber restorer' ( ) to restore its 'gripiness' and the inside of the platter should be cleaned to remove any traces of old rubber, oil and grease. Give the motor a few gentle taps to shift the bearings into place. the bearings might not be seated correctly in the bearing cups. When the motor is reassembled the rotor should revolve for a several seconds if you spin the shaft with your fingers. I use a fully synthetic friction modified light oil that should last for a very long time without deterioration. For 30 year old turntables it is usually necessary to disassemble the motor and clean the rotor shaft with a tissue and isopropyl alcohol, and use a paper stemmed cotton tip to clean out the bearing cups, then re-lubricate with a light machine oil, e.g. Double Sided Tachometer: One side of this record player's calibration strobe disc is the speed measurement function, and the other side is the head angle calibration function. Tachometers may measure remotely or require physical contact. Speed Adjustment: The speed of this record player calibration strobe disc can be 33, 45, 78 RPM, with 50 or 60Hz frequency speed detection and adjustment. Tachometers measure the rotation speed of a shaft or disk and display the results as revolutions per minute (RPM). Minimising friction in the motor bearings is critical for the motor to run to speed. In the laboratory, tachometers and stroboscopes are used to calibrate or check the speed of centrifuges and other equipment that rotates or vibrates. In reality there is always some 'slippage' and the motor runs slightly slower than synchronously. In this type of motor the rotor is 'dragged' around at a speed that is a function of the mains frequency and the number of poles in the motor. Many older turntables like BSRs, Garrards and other idler wheel types, or early Japanese belt drives have a large induction motor. Buy Stroboscope Disc, Practical Speed Adjustment Phono Calibration Strobe Disc Double Sided Tachometer Professional For Vinyl Record Player from Walmart. ![]() Granded I'm newish to repairing these record players, although i have an idea its the spindle bears or motor Records for my hearing seem to sound ok ,but there are times when your sure its not quite right when listening.
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