tonywinsc
Responses from tonywinsc
| Direct drive vs belt vs rim vs idler arm Your tt platter is a flywheel. Like any good flywheel design, the bulk of the mass is on the outer edge (Think 2001 A Space Odyssey). The moment of inertial equations illustrate the effectiveness of having the bulk of the mass at the outer edge. A... | |
| Direct drive vs belt vs rim vs idler arm Hi Dover, one thing to quickly recalculate is that the record spins 0.5556 revolutions per second. (Inverse of 1.8) So the speed error would be 0.008% if it takes 7200 seconds to lose/gain one rotation.What I believe is that we will hear a differe... | |
| Direct drive vs belt vs rim vs idler arm The iPhone app filters out the record runout. Easy to do since record runout has a 1.8 second period. And I go right back to the record runout issue. Record speed accuracy is at least an order of magnitude worse than any high end table made today.... | |
| Direct drive vs belt vs rim vs idler arm I have an FFT analyzer app on my iPhone. I used a B&K calibrated 1000Hz test tone and the FFT plot was dead on. It is about the frequency counter tied to the internal clock. I don't know the accuracy, but I figure it must be within the range o... | |
| Direct drive vs belt vs rim vs idler arm An accuracy of 1/1000 rpm is 0.003%. This is only as good as most high end tt's. It needs to be an order of magnitude better than that. It will be good for dialing in speed, but not for examining Wow&Flutter. If it is off 0.003%, then the plat... | |
| Sota Star Sapphire suspension question You might need to disassemble the platter bearing and check that the vacuum ports are not blocked. It wouldn't hurt to clean and re-lube the bearing since you may not know when it was done last- if you haven't done that already. I use a synthetic ... | |
| Direct drive vs belt vs rim vs idler arm I have never had a chance to try the Timeline device. Some have reported very impressive results with the Timeline. They have seen zero drift of the red line playing the entire side of a record. That is approx. 833 revolutions. I figure if my tt l... | |
| Sota Star Sapphire suspension question It takes a bit of tweaking to make the ET2 arm work with the Sota's suspension. I had a buddy with that same set-up years ago. I am recalling his experience, not my personal experience so take this for what it is worth. The tonearm mass moving acr... | |
| Direct drive vs belt vs rim vs idler arm I'd say that high mass would be something like 100 times greater than the mass of the record. That would be about 15 kg.This discussion got me in the mood to check my platter speed again. After playing several records the tt was warmed up and I kn... | |
| Direct drive vs belt vs rim vs idler arm I also meant to mention that by setting platter speed with this iPhone app, it significantly improved the PRAT of my tt. I had been using the little strobe disc for years to set platter speed. The speed was off by a significant amount using the li... | |
| Direct drive vs belt vs rim vs idler arm Motor speed control circuits have to be designed for the various types of drives. For belt drive tt's the circuits must likely be tuned specifically for the belt compliance/platter mass being used. DD tt's must have altogether different speed cont... | |
| Direct drive vs belt vs rim vs idler arm I'll take belt drive over the over versions and here is why. First, belt drive tt's in general have high mass platters. That provides not just speed stability but also dampening; dampening not just external vibrations but also motor cogging. The m... | |
| Magico S5 review What exactly are the advances in speaker technology during these past 10 years? Is it the cabinets, the drivers or is it in the crossovers? | |
| Tube Pre-Amp Recommendation If I were shopping for a preamp, sound would be my top priority but not my only priority. It might be a hobby; but it is still a business transaction. I do not rotate equipment very often but I still consider resale value to be very important. May... | |
| Preamplifier power supply There is another thread talking about a custom made tube preamp that sports an oversized power supply so much so that the unit weighs 75 lbs (34 kg). The owners of these particular devices have only accolades for the sound that this special preamp... |