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In Reply to: What type of controls work with this Garrard 401? posted by Ugly on January 14, 2017 at 19:19:53:
Hi Ugly,
It has taken me a while to respond as I have been thinking about this for a while.
As Steve said, your machine has a speed control already. It is not closed loop or tied to a quartz oscillator but it is loosely tied to your mains frequency. You have an induction motor with a rotor designed to slip at a speed proportional to torque load. There is an eddy current brake which puts a torque load on the motor which is proportional to speed. If your mains power is decent that should be good enough. If your power is nasty there is the very $pendy power source which Steve suggested. I'm pretty sure that will provide good clean power with low phase noise and quartz stability. This may very well improve the short term stability of your machine. You will however still not be closing the loop around the platter and the long term stability will still be somewhat determined by the eddy brake and the motor.
If you really want to close the loop on the platter and reference it to a quartz clock, something like that Roadrunner setup which Pheonix Engineering sells may do the job. You would set the speed of the eddy brake a bit high and let the speed box do what it does.
One issue you will have to deal with is that the Roadrunner setup puts out 5 Watts maximum. Your machine requires ~16 Watts. Either you will have to rig an amplifier between the Roadrunner and your motor or talk to them about making you a custom unit.
Phil
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Follow Ups
- RE: What type of controls work with this Garrard 401? - coffee-phil 09:56:06 01/16/17 (6)
- RE: What type of controls work with this Garrard 401? - Ugly 20:28:29 01/16/17 (5)
- Search "Mark Kelly" - Lew 07:39:08 01/17/17 (3)
- RE: Search "Mark Kelly" - Ugly 15:46:43 01/18/17 (0)
- RE: Search "Mark Kelly" - coffee-phil 14:26:07 01/17/17 (1)
- Phil, I think you are correct... - Lew 11:48:44 01/18/17 (0)
- RE: What type of controls work with this Garrard 401? - chasmturner@yahoo.com 20:51:04 01/16/17 (0)