I've always wondered this and thought it might be quite useful to measure with respects to seeing how some of the home brew bearing designs and tweaks measure up against the big boys.
Trade: Wakefield Turntables
Location: Yorkshire
Posts: 9,345
I'm Andrew.
How do you measure rumble through a bearing?
I've always wondered this and thought it might be quite useful to measure with respects to seeing how some of the home brew bearing designs and tweaks measure up against the big boys.
SS
CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10
VALVE
PRE Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker
Senior Member
Location: Deleted
Posts: 6,585
I'm Deleted.
How do you measure rumble through a bearing?
The easiest (though not necessarily the best) way is to use a test record with a fixed tone - record it onto your laptop and compare the frequency spectrums in Audacity.
Of course you need an appropriate test record, a laptop (or nearby computer) and Audacity (though that is free to download).
Account Deleted
Moderator & Terminator!
Location: N E Kent
Posts: 51,625
I'm Geoff.
I'd have thought a record with no tone, just a blank groove would be the thing. Or an accelerometer bearing down on the top of the platter spindle maybe?
There's always a chance of rumble being on the record, produced by the cutting lathe.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Trade: Wakefield Turntables
Location: Yorkshire
Posts: 9,345
I'm Andrew.
Ok, so recommend me a good test record
SS
CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10
VALVE
PRE Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker
Moderator & Terminator!
Location: N E Kent
Posts: 51,625
I'm Geoff.
The old HFS 69 record has a rumble test and silent grooves. I have a copy, it has its uses.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Senior Member
Location: Bristol
Posts: 111
I'm Clive.
The Hi-Fi Choice reviews in the late 80's used a precision "rumble decouple" system from Thorens.
This thread discusses the subject
http://www.diyaudio.com/forums/analo...ng-rumble.html
Senior Member
Location: Bristol
Posts: 111
I'm Clive.
Just checked and all 5 of the test records I have include a test for rumble using unmodulated grooves.Originally Posted by walpurgis
Moderator & Terminator!
Location: N E Kent
Posts: 51,625
I'm Geoff.
As a somewhat off topic aside. I have a test CD that is good for checking what you can actually hear from your system. Sweep tones and various fixed frequencies, etc. I learned I can't discern above 10kHz. But I get audible output at 30Hz in my small room, which theory says I shouldn't be able to do.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Trade: Wakefield Turntables
Location: Yorkshire
Posts: 9,345
I'm Andrew.
Thanks, looks like I might have a dabble.
SS
CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10
VALVE
PRE Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker
Trade: 20/20 Audio
Location: Glasgow
Posts: 7,730
I'm Brian.
I for one would be very interested in your findings Andy . I'm still using the original bearing on my GL75 .
Regards
Brian
Sell your cleverness and buy bewilderment . (Rumi )
Korus Computer Audio music server
JustBoom DAC . HRT Musicstreamer 2
Amplifier : Sony TA FB740R
Speakers : Tannoy 637
Interconnects : MS Audio / Klotz MC5000 .
Speaker cables : Western Electric 16AG
Posting Permissions
Reply With Quote