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In Reply to: Rega counter weights (again?!) posted by Aleksunder on September 11, 2006 at 06:07:53:
see link for a too long discussion on this tweek.horizontal stailization.
~Slainte,
The OMalley
Follow Ups:
Been reading the Audiogon thread - useful, thanks.
I think what that arrangemment does is help with 'sinking' audio-band resonance by adding mass to the yoke, but in terms of the arms 'dynamics' it's only adding mass to the arm's 'yaw' momment and not really changing anything in terms of loading the vertical bearings.It's a shame Rega didn't use a full 'bell' type yoke instead of the open one they went with.
I ordered a set of four #3 grade ceramic hybrid 6x13x5 flanged bearings for my RB250's. Expect this to be a big improvement over stock. Another supplier stocks #5 hybrid ceramics, but not in a flanged bearing.
The ceramics are rounder, and have a lot less friction compared tgo steel balls. I hope they are quieter also.
The upgrade bearings are maybe the final tweak for my rewired, new stubbed, damped arm tube RB250's. The horizontal bearing replacement looks like it would also yield a better performing arm. Anone know the size of that one?
....a veritable alchemcal transmutation of the humble Rega into a bona-fide super-arm, by the sound of it.How much are those bearings?
Do you intend to use slightly more 'preload', and hence achieve less play than the standard bearings?
Thanks for the source link.
I have not pulled one apart. Is there four bearing? I thought a four pack would allow redoing both my arms.
The four pack is 90.00, not chicken feed, but less than a counterweight. The non-flanged #5 ceramic hybrid 6x13x5 at vbx are 10 for 50.00. But these are not flanged. Wish there was a #5 flanged at 5.00 a pop.
I suspect a 5 grade ceramic will be as free moving as the #3 in steel, plus less rattling due to the tighter tolerances. This would really supe up the lowly RB-250.
No - as it happens I seem to have a 'good' one - dead horizontal headshell azimuth, and the bearings have no detectable play with about 1/40th gram stiction in both planes.
Well, I simply balanced the arm statically and used pieces of printer-paper cut up into little squares and added them to the head-shell, with quite a bit of trial-and-error nudging the arm with a strip of paper.I have to confess, not definitive, and more honestly, I'd put the vertical stiction bewteen 1/30th and 1/50th g.
Horizontal sticton is an even rougher guestimate, as I had muck around trying to balance the residual anti-skate, but the arm swings identically in both planes when held vertically, if you see what I mean.
Yah - I had my eyeballs calibrated so I could use them to set spark-plug gaps. Probably drifted out by now, though.
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