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Groove Runner Turntable Speed Control

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 4:29pm
very neat and well presented.  If anything like my Power supply upgrade it should make a worthwhile improvement.   What mains connection does it have -difficult to see from the picture?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 4:29pm
Simply beautiful!
Beautifully simple!
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 8:11pm
I enjoyed following this subject, but am sure that I don’t understand it all.  Maybe l’m a bit twp (it’s Welsh).  I have a Manticore Mantra from the late ‘80s or early ‘90s. How would I use it? Is it just a case of plugging the TT’s power cord into the Groove Runner and the Groove Runner into the mains?

I don’t suppose it is that simple.
Ifor
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 9:04pm
Originally posted by ICL1P ICL1P wrote:

How would I use it? Is it just a case of plugging the TT’s power cord into the Groove Runner and the Groove Runner into the mains?

I don’t suppose it is that simple.

I have mine running my (upside-down) Rega which is currently fitted with standard motor and its  230V pcb.

The 13A plug was changed for the 3-pin "mains" DIN plug which is supplied with the Groove-Runner (it's the type of plug used on a few other turntable controllers and is commonly found on Weller soldering irons). This plugs into the right hand socket and has a locking mechanism. Only the "live and netral" wires are used.

The Groove-Runner is powered from a tiny inline switched-mode 15V DC power supply capable of much more current than the Groove-Runner needs. Its DC plug connects to the left hand socket.



Because the Rega motor uses the 230V board the Groove-Runner output voltage control has to be at maximum, at which it is outputting a measured 113V AC on-load (110V nominal).

The Rega starts up without assistance with the Groove-Runner set to 50Hz and 33.1/3 rpm (surprisingly).

Start it on 45rpm and it tries to run backwards. Not surprising if you understand the 230V Rega board. But a little hand assistance gets it running clockwise OK. Either that or start it on 33.1/3rd and switch it to 45rpm.

If the Manticore Mantra uses the same motor and a similar pcb to the Rega it might run the same without modification. However, a "bag of bits" will accompany the Groove-Runner and instructions will be given as how to modify the sandard Rega motor - and other motors - to run on 110V nominal, and down to the 90V minimum of the output voltage control.

Information will eventually be published here in greater DIY detail.



Edited by Graham Slee - 15 Aug 2018 at 9:06pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 9:48pm
I believe the Manticore Mantra uses a “standard AC Premotec motor”. I think this is the same as early LP12s, if not later ones. Please correct me if anyone knows different.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 10:22pm
If you can see the motor it should have one of these part numbers:

9904 111 31813

or

9904 111 31819
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 2018 at 10:37pm
i’ll try to have a look when i’m at home.

Edited by ICL1P - 15 Aug 2018 at 10:38pm
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