Hi guys I know this isnt a class piece of gear but I think the bearing
I made for my home built TT may be of use and its dead simple-
When you make the spindle support bush it will probably have the drill
angle left at the bottom of the tube, 118 degree vee for a normal twist drill. Drop a suitable ball bearing into the bush about 1/4 or 5/16 depending on the spindle size .Drill the end of the spindle so that a
1/8 or 3/16 ball bearing fits in to just over half its depth and peen it in with a dot punch. eh voila hardened steel point contact. fill with oil to taste.
I made for my home built TT may be of use and its dead simple-
When you make the spindle support bush it will probably have the drill
angle left at the bottom of the tube, 118 degree vee for a normal twist drill. Drop a suitable ball bearing into the bush about 1/4 or 5/16 depending on the spindle size .Drill the end of the spindle so that a
1/8 or 3/16 ball bearing fits in to just over half its depth and peen it in with a dot punch. eh voila hardened steel point contact. fill with oil to taste.
Has anyone consider the magnetic effects of the magnet on the platter spindle? The magnets act as a damping material absorbing sonic energy from the stylus and record interface. The belt drive bearing allows the sonic energy to resonate back to the turntable. This contribute the different sounds of boxy turntable and single solid piece plinth.
-->The magnets act as a damping material absorbing sonic energy from the stylus and record interface. <--
How does a magnet absorb sonic energy?
How does a magnet absorb sonic energy?
There is a magnet on the spindle and many fixed magnets surrounding the spindle to create the turning torque. As the spindle magnet attempts to resonate/dissipate the vibration from the stylus, the surrounding magnets also apply magnetic field to turn the spindle. This magnetic field prevents the spindle and its magnet to resonate naturally with the sonic energy and conform to the magnetic field. It's like to have one magnet attached to a fork of the musical instrument tuning fork and another magnet attached to a fixed location. The magnetic field interaction between these two magnets affects the tuning fork ability to reasonate naturally to mechanical vibration. Some tonearm used magnetic field to dissipate stylus energy and stabilize the arm. It's just an elementary schoolboy observation.
pixpop said:
Although I'm not entirely sure, I believe he's talking about eddy current damping.
See this page for a much better explanation than I could possibly come up with:
http://farside.ph.utexas.edu/teaching/302l/lectures/node73.html
I understand eddy current damping, e.g. as used in the dynavector tonearm, and also those with the magnetic suspension.
I don't see how it relates to acoustical energy in the spindle of the TT. I think, because the magnetic fields are balanced around the spindle, the net changing field seen by the metal of the spindle is very small.
Nghiep, do you know how much damping is introduced by this mechanism?
I don't see how it relates to acoustical energy in the spindle of the TT. I think, because the magnetic fields are balanced around the spindle, the net changing field seen by the metal of the spindle is very small.
Nghiep, do you know how much damping is introduced by this mechanism?
my god...
are we getting theoretical!
I just heard an interesting interview with Simon Yorke ( http://www.recordplayer.com )
He had much of the same preferences as I suspected...
Everything in the design should not be dampened.
But to find the right resonances that work together.
Do as he do, just build, try, replace, modify, build again...
Arne K
are we getting theoretical!
I just heard an interesting interview with Simon Yorke ( http://www.recordplayer.com )
He had much of the same preferences as I suspected...
Everything in the design should not be dampened.
But to find the right resonances that work together.
Do as he do, just build, try, replace, modify, build again...
Arne K
-->Do as he do, just build, try, replace, modify, build again... <--
Good advice, I think.
I'm on my way. Ordered my reference tonearm today, and on the lookout for a nice chunk of slate for a shelf in my room. I'll post pictures as soon as I have something worth looking at.
Neil
Good advice, I think.
I'm on my way. Ordered my reference tonearm today, and on the lookout for a nice chunk of slate for a shelf in my room. I'll post pictures as soon as I have something worth looking at.
Neil
like...
As with anything, Direct Drive can be great if implemented correctly.
Take the Denon DP-59L, one of the best DD ever. I just so happen to have one up for sale on EBay. . Speaking of resonances, its 2 tonearms (one is serpentine) had different resonant frequencies as I recall.
With this and my Nakamichi RX-505 you can have some sweet analog sound.
(sorry about the shameless plugs, figured you all would like to see some classic stuff....plus I can't let go.....ouch.......)
As with anything, Direct Drive can be great if implemented correctly.
Take the Denon DP-59L, one of the best DD ever. I just so happen to have one up for sale on EBay. . Speaking of resonances, its 2 tonearms (one is serpentine) had different resonant frequencies as I recall.
With this and my Nakamichi RX-505 you can have some sweet analog sound.
(sorry about the shameless plugs, figured you all would like to see some classic stuff....plus I can't let go.....ouch.......)
With this and my Nakamichi RX-505 you can have some sweet analog sound.
Till the tape wraps itself round the capstan!
Till the tape wraps itself round the capstan!
baggins said:
Hardly with a dual capstan machine...even rarer on a Naka...
-unless you keep your lunch inside the tape-comparment.
Arne K
Apparently yes .....here is a brand new DD turntable that come out recently. Since this manufacturer has some reputation to lose, I presume he knows what he is doing: http://www.brinkmann-usa.com/oasisturntable.php
Had it happen on aiwa dual capstans .I,m not an expert on cassette
technology but I thought they were reasonable transports & yes they can sound great when everythings tickety boo .But I lost a nice
copy (oops) of some opera arias and Ive been wary of them since
incidentally it was TDK ordinary tape ,I dont Know if that makes any difference
technology but I thought they were reasonable transports & yes they can sound great when everythings tickety boo .But I lost a nice
copy (oops) of some opera arias and Ive been wary of them since
incidentally it was TDK ordinary tape ,I dont Know if that makes any difference
baggins said:
I think it does. With dual capstans and a thicker tape you will not have that problem. I've played and recorded thousands of tapes in the last 20 years and only one time, on my Technics, did a tape wrap itself up, and it was one of my cheapie tapes, which for some reason had a lot of good tunes on it. Never had any problems with TDK SA, SAX or Maxell XLII, XLIIS.
Re: Re: like...
Actually, I'm a fan of direct drive over belt drive turntables. It is the "as with ANYTHING" part that I take issue with.
Max
lgreen said:
maxro said:
MRupp said:
Actually, I'm a fan of direct drive over belt drive turntables. It is the "as with ANYTHING" part that I take issue with.
Max
I have in front of me a TDK D type and a Maxell UR cassette and no where on either package is the thickness of the tape stated are you
advocating only the use of chrome etc are all standard tapes suspect?
advocating only the use of chrome etc are all standard tapes suspect?
In a perfect world
-all tape would have same thickness. This will however vary more between brands, and length, than type. That is why lenghts over C-90 (C-120+) often not are recommended.
But it is a minor detail.
Regular maintenance of the Deck is more important.
Arne K
can we get back to DD TT ?
-all tape would have same thickness. This will however vary more between brands, and length, than type. That is why lenghts over C-90 (C-120+) often not are recommended.
But it is a minor detail.
Regular maintenance of the Deck is more important.
Arne K
can we get back to DD TT ?
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