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In Reply to: Just bought an N-33 H ROK belt drive.... posted by tubesforever on September 9, 2006 at 22:37:31:
You will need heatshrink to correct the speed because the shaft is convex, and the string tends to ride to the narrowest part. You will also need for it to be hard vinyl heatshrink. I tried several before I found one that worked, so I'll send you a little kit with some of that, and some thread. Heat the shrink while you are checking the speed with a strobe disc. Then, quickly remove the heat when the speed is correct. You may have to put a bit of superglue on the knot to keep it in place, too. This setup will beat the Rek-O-Kut idler, a Linn LP12, any Rega ever made, and God knows what else, if you clean the bearing with brake cleaner, and oil it with two parts Castrol Syntec (any flavor) and one part 90 weight Mobil 1 gear oil. If you want it to really sing, replace the bearing with a silicon nitride one. Take the motor outboard, and drop the platter assembly into a heavy plinth, and you will probably step up several levels. That's my next project.
Follow Ups:
While I love the idlers for dynamics and bass, I also miss the dead quiet background of my Thorens. I am playing it side by side with my two idlers and the Thorens is very involving and engaging.....It has also been modified like crazy.
I wonder if a tungsten bearing would not be an ultimately quieter bearing than the silicone model. I should try one of each and let you know.
I am hunting for one more Pabst for a special project in mind. BTW I got the table on ebay for 89.00 bucks....I am stoked.....I tried to buy another today but another inmate paid some serious green. I bet he loves the thing.
Mosin, If I can get some thin width mylar film, would that be as good as the thread drive, or am I rowing up a creek without a paddle. I would think the extra surface tension would improve dynamics and prat.
You're rowing up a creek without a paddle.
I am looking forward to the N-33 as much as I was looking forward to the idler.BTW I was originally using 45-75 hypoid Mobile one gear oil for the main bearing on my LP-743 and ScottRT mentioned hearing a warbling on the table compared to the Technics CDR I sent to you.
So I cleaned it all out yesterday and I am running 10-30 weight Mobile One full synthetic oil and I do hear a slight improvement. I think I will try some 5-20 weight next go around.
I have that ADC running on the Unitrac and damn if you are not right again. It just seems to improve with each hour of play. Miraculous to hear it bloom. I am spinning some Beatles albums I picked up at the thrift store on Thursday evening and having the time of my life.
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