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In Reply to: RE: The theory behind the idea is sound... posted by EdAInWestOC on May 29, 2012 at 09:03:52
Good point about the dedicated turntable motor speed controller but what about this idea....
How about a PS Audio P300 power regenerator? It takes AC in from your mains and regenerates it as a filtered and pure rock solid sinewave and you can even select the voltage and frequency output. If you choose 60Hz it stays at a rock solid 60Hz. Same for voltage. Choose your output voltage and it stays there regardless of how your AC mains are fluctuating (within reasonable limits).
Would this be a viable alternative to a TT motor speed controller? I think it might, unless the speed controller is somehow run in a 'closed loop' fashion where it adjusts based on a feedback signal from the motor, maybe in the form of a tachometer.
Follow Ups:
The whole reason i bought the PS Audio P600 was reading an article about 'alternate' Hz for the A/C power supply and how a faster HZ on the current gave more power available to the components power supply (as the power supply uses the peak mostly, so more peaks, more power)
I had to find one WITH the optional, no longer available HZ board.
I did aand am one happy camper.
I tried 75hz and 90 hz and am happiest with it set to 110hz.
But the SDS has additional features to control the speed at 45RPM plus the stylus timer thing.
The SDS would be optimized to work with VPI motors and I'm sure they tested it to make it generate the most motor friendly waveform possible. The other device's point is to produce a sinewave power waveform.
Its just the difference between the point of the devices and the convenience of the 45RPM thing.
Ed
We don't shush around here!
Life is analog...digital is just samples thereof
Thanks for the replies. I even understood most of them, which is great!So a UPS isn't ideal but there are other possibilities such as the PS Audio device mentioned and the turntable speed controllers listed.
Regarding turntable speed controllers, does anyone have any experience of the Heed Orbit 2? It is a relatively straightforward device that even I could fit (it only requires the replacement of the plug on your turntable), and claims to output a steady 230v AC (I am in the UK) and offer switchable 33/45rpm by altering the frequency between 50Hz and 67.5Hz. The PS Audio is available in the UK but I don't think the increments of frequency change would allow it to do 45rpm (unless I have misunderstood how it works), though this is not too much of an issue as 45rpm is achieved on my turntable by the changing of belt on pulley. The VPI SDS looks interesting but I don't think it would suit my turntable as it only outputs 115v.
How about something like this:
Edits: 05/30/12
The SDS made my VPI TNT Mk. II sound much better than using the P300 without the SDS. But this was many years ago. All are gone now.
Some Sondek owners with a Naim power supply use a PP300 to spin 45 rpm records with a 60hz Linn motor instead of futzing with changing a pully. ( PITA )
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