Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: Suggestions for inexpensive tweaks/upgrades to improve system

Posted by jeromelang on June 27, 2012 at 00:39:40:
It seems that the motor of analog turntables have a "memory" problem.

Every time the motor is stopped (to change sides or to change LP altogether), the power supply to the motor must be disconnected first, then connected on again. The sonic differences, as a result of "refreshing" the motor is very dramatic.

This problem occurs regardless of whether the turntable motor is fed direct from the wall, or fed from a speed controller device.

In fact I first discovered it while fiddling with a speed controller device.

I discovered that LP playback sound becomes forward, muddied, bass bloated (some people might like this actually) when the speed control unit was changed from 33rpm to 45rpm, then back to 33rpm again. On a hunch, I disconnected the power supply to the speed controller unit and found that the "refreshed" scu makes the turntable/LP sounds more opened, more detailed, more dynamic, more musical all at the same time. I, and a few other listeners repeated the test with several other different LPs and turntable models, and found the sonic results repeatable and consistently audible, without straining to hear it. Later I discovered the same thing at home with my gyro se, which works without a scu, and in other people's systems, with several other turntables, also without scu.

Luckily my gyro se turntable motor is driven by a separate ac line from the wall (within easy reach of my left hand) away from the dedicated ac line feeding the pre and phonostage, which is behind the equipment. every time I stop the turntable, for whatever reasons, I just need to refresh the ac feeding the motor to consistently get the level of dynamics and clarity that i didnt know this turntable is capable of. It is like I got a $3000 upgrade to my gyro se!