Copyright © 1998
Cadman Enterprises Ltd
Welcome to the Graham Slee Audio Products Owners Forum Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here) This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd |
Groove Runner Turntable Speed Control |
Post Reply | Page 123 6> |
Author | ||
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
Posted: 09 Sep 2019 at 7:25pm |
|
From what John C tells me, a turntable manufacturer will be trialing a sample batch as soon as he gets them built. The main delay at present seems to be the output transformers. If the response is positive we will place it on sale on the forum. The reason it hasn't been offered so far is due to the limited interest in this topic. There seems to be only 3 potential sales I also don't consider it could be a general sale item because it requires a little more understanding than a plug-n-play item. Even if supplied fully built the user will need to at least change the turntable plug. Everything these days has to be fitted with a plug, so the Groove-Runner could only be legally sold to a DIY'er.
Edited by Graham Slee - 09 Sep 2019 at 7:26pm |
||
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
||
Ernie
Senior Member Joined: 23 Jan 2014 Location: Birmingham UK Status: Offline Points: 386 |
Post Options
Thanks(0)
|
|
Any nearer to releasing the Groove Runner?
|
||
There are 10 kinds of people. Those who understand binary and those who don't.
|
||
Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Online Points: 8960 |
Post Options
Thanks(0)
|
|
Jon: I considered that and was considering a Premotec motor with the phase adjustment to minimise vibration. Then I started to look at DC motors and went that way. |
||
Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
||
BAK
Senior Member Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1744 |
Post Options
Thanks(0)
|
|
Those of us who have been here awhile know that we will be satisfied when you feel satisfied enough to put your name on your latest design(s). They always sound and work the best.
Edited by BAK - 12 Oct 2018 at 2:57am |
||
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! |
||
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
|
Ahha, the scope and its decimal places... wishful thinking but it will go no lower than 10Hz resolution. But my AP is a different story: I didn't think you were criticising my work. It's only right that I should be questioned or nobody will ever learn anything from these posts and topics. It's good for understanding what things do. I don't pretend to have exhausted every possible measurement simply because in my mind electronics aren't as exact as some would like to believe. But then again I suppose I take some things to their extremes... As an example, I'll be hopping over to the 70s amp topic shortly because I'm not satisfied with the power amp quite yet. The bugger is keeping me awake |
||
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
||
Ernie
Senior Member Joined: 23 Jan 2014 Location: Birmingham UK Status: Offline Points: 386 |
Post Options
Thanks(0)
|
|
Understood Graham,
Hope you don’t think I was criticising your work. Rega have obviously done a lot of work on their passive supply to get the best out of this motor and fair play to them. I wonder what the scope would show with the Rega circuit (or the other circuits for that matter) connect to the mains supply. Btw just notice the scope readings show the frequency to 4 decimal places all zeros. You certainly go to some lengths for us don’t you! |
||
There are 10 kinds of people. Those who understand binary and those who don't.
|
||
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
|
Re your edit, the added (series) resistor for higher frequency use is shown here: https://www.mclennan.co.uk/datasheet/1565 As 3/4 of its intended use is at 60 - 81 Hz I considered it a better choice than just having the 0.1uF capacitor. It also runs well at 50Hz, especially as the motor is operating on half intended voltage. Plus it will start and run at minimum output which is just below 90V. It is incredibly quiet in operation and starts up in the same time as a 31813. Also please understand that the Rega scope waveform was just an observation, and I only included the original circuit as part of the explanation that the Groove-Runner is able to drive the 230V version unmodified (at least the one I have), which might be a plus point to somebody contemplating a purchase.
Edited by Graham Slee - 11 Oct 2018 at 11:02pm |
||
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
||
Post Reply | Page 123 6> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |