lewm
Responses from lewm
| Turntable speed accuracy Accuracy or sensitivity of speed monitor device should be proportional to (1) distance of sensor from center of rotate (longer radius is better) and (2) stability of the strobe at 60 hz per second. Ergo in theory the kab strobe (battery powered an... | |
| Turntable speed accuracy Bearing lube for dd turntables is yet another controversial subject. Fortunately, the rotation is so slow and relatively low stress that almost anything will do to prevent bearing damage. One guy who restored my L07D insists on only a certain weig... | |
| alternative power supply for Garrard 301 I read my own earlier post above, and I don't know what I was thinking. My own experience with lenco motor (similar to garrad) and mark kelly's teaching both tell me that controllers designed for ac synchronous motor (walker, vpi Sds, notts wave) ... | |
| Turntable speed accuracy It seems like none of us read each other's posts, except Raul and DT, so that they can reach immediate disagreement. A century ago an American writer named Ambrose Bierce defined "conversation" as a social interaction wherein I wait for you to fin... | |
| Turntable speed accuracy Gosh, what is left to say or think after that?I agree that direct-drive turntables can be highly "colored", in a bad way. I also completely disagree; speed stability is the sine qua non of a turntable, no matter the drive system. "Sound quality", ... | |
| Turntable speed accuracy Dear Tony, Cogging is indeed a problem with motors, but what I described would not be strictly due to cogging. Mostly it is due to the servo hunting when its feedback loop is screwed up by the lack of a platter mass or in the other extreme, too mu... | |
| Turntable speed accuracy Tony, What I meant was that in direct-drive turntables, the motor, the drive system (aka servo), and the platter together form a closed system. So indeed the mass of the platter has everything to do with it. If you don't see what I mean, try remov... | |
| Turntable speed accuracy Tony, I don't quite see your "one revolution" hypothesis. The platter once in play never comes to a complete halt. I think the point is that the motor needs to have "enough" torque to keep speed stable. And the definition of "enough torque" is rel... | |
| Turntable speed accuracy I am with you in this dilemma, which is why I hate the word "neutral" when used to describe an audio product. It can have any meaning that the user wishes it to have. One meaningful way to use it would be to say that "I have heard this or that LP ... | |
| Rockport Sirius III & Micro Seiki 8000 comparison Re: the putative new Micro-Seiki. For a vinyl equipment-phile (note I did not say "audiophile" or "vinylphile") that thing has the appeal of waking up after a hard night partying to find a Ferrari 458 Italia in your driveway and then remembering t... | |
| The greatest MM and MI cartridges .... OK. Here's a vote for the Pickering XSVs. I've got both a 3000 and a 5000. Stanton 981LZS is my fave of the Pickering/Stanton group. | |
| Turntable speed accuracy Dear Thuchan, Please do not jump, but isn't the answer to your question obvious? If the 3 tt's sound different, then they are introducing different "colorations". Or possibly one is "neutral" and the other two are introducing colorations. No matte... | |
| Need advise on Oscilloscope No (AVS) and no (Sunny). Azimuth adjustment is not about output per channel. It is about crosstalk. Although you can in theory at least use a 'scope to do azimuth, it is more complex than you might think (first you normalize the output of one chan... | |
| Turntable speed accuracy Thanks, Tony, for introducing some science to the foregoing discussion. I know I am going to sound like one of Syntax's "fanboys", but I have been listening to my Technics SP10 Mk3 for the first time in extensive sessions over this past weekend. A... | |
| Need advise on Oscilloscope Many/most scopes have a built-in calibrator.But how would you use a 'scope to reach your stated goals? |