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In Reply to: RE: Is this available? posted by JLSmith on May 09, 2014 at 09:46:29
That's because the product is in beta trials now. John is one of my longtime beta testers and couldn't restrain himself once he finished it and listened...
This product originated several years ago as an idea (and a first prototype) when I was negotiating to bring Rauna/Opus3 turntables into the U.S. and sell them. Ultimately, that didn't work out, so the TT PS languished. One of the guys here in Audio Sunday School (Trent) helped me improve the design by building variants that we could test. The current design emerged from that effort. Several of the guys here built them in 2010 and nothing more happened due to my time constraints.
However, contacts who reacted to my webpage get trickling in and John pestered me for 3 years to get him one. So I relented and made minor PC board changes, and now plan on getting a small batch out there available to purchase. I haven't taken any pictures except the one attached. Due to the time necessary to support a kit, I'm strongly considering offering it assembled-only. The price will be determined in a couple of weeks, but it will be between $700-$1K. The features that my supply has are very similar to ones that high-end turntable manufacturers sell for $2K-$4K. Compare the features that John describes to the more modestly priced ones offered by, for example, the Music Hall Cruise Control (http://musichallaudio.com/cruise-control/) or the VPI SDS Synchronous Drive System (http://www.musicdirect.com/p-7709-vpi-sds-synchronous-drive-system.aspx). Both of these have impressive frequency displays that are really good only for noting the correct frequency for old off-pitch 78s! I've put the money behind features that LP players can use to improve their music listening.
Kevin Carter
K&K Audio
www.kandkaudio.com
Follow Ups:
Pretty cool. When will it be available and do you have any specs you can release?
What specs do you need to see?
Kevin Carter
K&K Audio
www.kandkaudio.com
I have several tables. I have a VPI classic with a 10W motor and a Gerrard 301 with a ~20W induction motor; will your supply work with these?
What is the frequency and phase adjustment range?
When do you expect to be shipping product?
The power supply only works with synchronous motors, not induction motors.
Kevin Carter
K&K Audio
www.kandkaudio.com
Got it. No go on the Gerrard. The VPI is an AC synch motor.
I'm guessing that with a knob for frequency control this isn't synthesized? Do you have a spec on frequency stability? What about FM? PSRR?Do you have a price worked out yet? Kit or Assembled?
Edits: 07/30/14
Any love for us here in New Zealand?
big j.
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
There is always love for all of our former colonial brothers and sisters. ;+))
The center frequency can be supplied as 50Hz and there are built-in internal switches to select mains voltage (115/230) and motor supply voltage (115/230).
Kevin Carter
K&K Audio
www.kandkaudio.com
Hi Kevin
Seeing Jusbe's turntables seem to be idlers, does this mean this will work with shaded pole motors and the like?
Cheers
Grant
I should make it clear that the only type of motor that this supply will work properly with is the hysteresis synchronous motor, the type most often present in "modern" audiophile turntables. It will not work with DC motors, three phase instrumentation motors, or shaded pole motors, nor will it work with the large motors in transcription/radio station type turntables. Commercial hysteresis synchronous motors typically have 4 or 5 wires (extra one being a case ground wire) and have a small capacitor between the "hot" AC mains lead and one of the motor wires. See the link below for a thorough discussion of synchronous motors, if you are unfamiliar.
Kevin Carter
K&K Audio
www.kandkaudio.com
Count me in. Hopefully it will be compatible with VPI Traveler version 1, which has a regular IEC power cord in the rear; the version 2 has some 'switcher' looking supply. I may upgrade to a Classic which should be compatible.
Best,
Anand.
I checked on my turntable (Wilson-benesch full circle), which uses a "250rpm Premotec AC-synchronous motor", hopefully this will work too!
Keep up the good work, Kevin!
-Ed
That will work.
Kevin Carter
K&K Audio
www.kandkaudio.com
I bought a Wilson-Benesch Circle a couple of years ago and will put it into operation soon. I assume it has the same motor as the Full Circle, but don't know for sure and I will research. If it's a different motor I'll post here and ask if your controller will work with it.
The circle and full circle are the same table, so you should be all set. The full circle just comes with the arm and cart, vs. just the table for the circle.
When I get a chance to write up the process, I'll build a webpage or something on how to rewire the Circle turntable motor to take full advantage of the K&K motor controller kit. That should help some folks.
-Ed
Ed, did you build that webpage or start a new forum topic?
Not yet, but soon hopefully!
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