Home Tweakers' Asylum

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

RE: Perhaps I figured it out...

Twice the pulses of balanced AC is a good thing. Here is info onsynchronus AC motors.

ET



"""Some P300 users have discovered that these devices are a splendid source of pure AC for running their AC synchronous turntable motors. Indeed, the more expensive Walker motor-drive, designed by Dan Fanny of AHT, works on the same principle though it has a lower power output and it can't be used for powering multiple components.

For the 33.3 RPM speed the Power Factor (line frequency) must be set to the 60 Hz default setting. Some turntable manufacturers such as Walker, Basis, VPI and Rega make turntables with AC synchronous motors that are stable when used at a higher line frequency. This means that dialing in 80 Hz, or 81 Hz to be more precise, will result in an increase to the 45 RPM speed. However other turntables with synchronous motors that use a certain type of speed control circuitry could be damaged by prolonged operation above 80 Hz. Among these are Roksan, Merrill and others, which can still be operated safely at the 60 Hz setting. Of course turntables using DC and non-synchronous motors won't be affected (and the speed won't change) by altering the line frequency. Likewise CD players and transports should not be affected. When in doubt, ALWAYS consult the manufacturer.

In current P300 units, there is no way to set the Power Factor to exactly 81 Hz. Some users have found the 80 Hz setting to be close enough to suit them. The good news is that all Power Plants manufactured after October '99 will be programmable to 81 Hz, for exact 45 RPM turntable speed, though it won't be fine-tunable like the Walker unit."""
ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936


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