1/3/2023 0 Comments Garrard zero 100 motor![]() These may be across the switch contacts.Īs pertains to motor RPM (thought I would mention this in case someone was curious), the only speed control I have ever seen for a common shaded pole “squirrel cage” motor was on a Sears console. The motors are designed to take wide variations in voltage. With rare exception you can’t vary the rpm of the motor with phase controls etc. With the idler engaged (if the rubber is still pliant) you will probably hear little or no increase in rumble. If the platter is in neutral (with the motor turning) the idler will not be involved. Put the stylus on the bottle top with the motor running. Put a plastic bottle top on the deck under the headshell. The idler doesn’t transmit vibration so much as it comes up through the deck, to the platter, and then to the stylus. It has a speed control knob for the AC motor, but there is an extra coil on the motor for this. The better Garrards have good silent motors. Some of the better changers of the console era such as the Magnavox/Collaro have fairly well balanced motors. Then you can’t get much done with vibration. If the changer is too cheap then the motor will not be balanced. It is hard to tell whether they are turning or stopped. There are precision changer motors from the 50s and 60s. I make my own, but the rubber stock may not be available to you. What you need to do is replace the motor mounts with the right rubber. ![]() ![]() AC motors tend vibrate by nature because of the modulating field in the stator. I think you are wasting your time trying to vary the voltage to reduce vibration. When varying the AC voltage the motor will stay at one rpm until you get down to a certain voltage and it will simply stop turning. There are ways to cure these problems, but this is not the issue here. I have worked on vintage changers for years and have encountered the problem of the motor running too slow or too fast. It isn’t really synchronous because the shaded pole allows it to slip under load. I will assume that it is a changer with an AC shaded pole synchronous motor. ![]() Long thread, I looked through some of it. ![]()
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