Methods for Reducing Turntable Motor Vibration - Page 4 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th October 2012, 01:43 PM   #31
YNWOAN is offline YNWOAN  United Kingdom
diyAudio Member
 
YNWOAN's Avatar
 
Join Date: Jan 2007
Many thanks.

As an aside, as a result of your recent investigations in to power supplies (not to mention your generosity in actually providing the parts), I built this yesterday:

Click the image to open in full size.

That's the underside of my turntable by the way .

I'm surprised by how much difference this mod has made; the leading edge of notes seems noticeably more defined - I wonder what the measurements would tell us.
  Reply With Quote
Old 19th October 2012, 04:19 PM   #32
diyAudio Member
 
Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917
Blimey now there's an indulgence, I like it.

To be honest having seen the results of the recent speed test FM demodulations I don't think there's much more to learn from more measuring. We are basically at the limit for the test pressing used. Maybe it's time to waste 100 on that genuine DIN test record.

I'd be interested to see some wavelet analysis, I think it was Dom who showed that on PFM, as that easily identified the difference between your deck and mine vis-a-vis your lack of 33 1/3 signature noise due to you not having a point contact on your mag-lev main bearing.

It could be interesting to see some spectral from the motor feed and indeed feedback, I suspect there maybe some reduction of higher frequency harmonics. If I could arsed I'd buy that PS Audio regenerator and drive to Gwent to collect it, that could prove interesting- or an expensive waste of money.... ;-)
__________________
hoping to pick up some things.
  Reply With Quote
Old 19th October 2012, 05:44 PM   #33
YNWOAN is offline YNWOAN  United Kingdom
diyAudio Member
 
YNWOAN's Avatar
 
Join Date: Jan 2007
Yeah, it is a bit OTT (fully potted too ). However, one benefit of making it this way is that it can be easily removed from the circuit and A/B compared. Presumably back EMF is the issue, I don't know.
  Reply With Quote
Old 19th October 2012, 10:01 PM   #34
diyAudio Member
 
Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917
It runs both ways, back emf from the motor pollutes the traffo in the Geddon and HF crap already on the mains does the same to the motor. Nothing's perfect.

How did you attach them in the end, one one each positive phase? I guess you could do with another for the return. I did mine, one across both phases- before the split and one on the return. 3 might be better... I'll wind some more.
__________________
hoping to pick up some things.
  Reply With Quote
Old 19th October 2012, 10:28 PM   #35
YNWOAN is offline YNWOAN  United Kingdom
diyAudio Member
 
YNWOAN's Avatar
 
Join Date: Jan 2007
Yeah, that's right - but on mine, both returns are kept entirely separate (4 core cable) and so I guess I would need 4. The ones you gave me aren't the ones you were making though - these are ferrite cored toroidal types.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help required for using a FDD motor as a turntable motor. binspaul Analogue Source 5 13th May 2009 03:59 AM
WTD - DC turntable motor + controller copydex Swap Meet 0 12th December 2008 07:54 PM
LRK motor for Turntable? pixpop Analogue Source 1 17th June 2007 03:30 AM
AR XA Turntable - WTB Motor bluemt Swap Meet 0 27th December 2005 05:37 PM
Motor for turntable. Tomek Analogue Source 33 9th October 2003 11:29 PM


New To Site? Need Help?

All times are GMT. The time now is 05:41 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2