QUOTE (MugFunky @ Jul 29 2004, 08:41 AM)
definitely get a deck with a pitch control on it (10% may not be much , but effectively it is a free sample rate boost).
Decks with pitch control limit you to DJ (poor sound quality) and broadcast (rare & expensive) types. It is far easier to just get a deck that rotates at the correct speed in the first place. Very few good HiFi turntables include pitch control. And I don't understand your comment about a "sample rate boost" - what do you mean by that?
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preferably direct-drive, with a good power supply.
There is no intrinsic reason why direct drive is better than belt drive. In fact, you'll find that most affordable turntables with decent sound quality are belt drive. *Good* direct drive is expensive to engineer.
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as for preamps, i'd get one that had the option for turning off the RIAA preamp - the RIAA curve can be applied more accurately in software, and if you use a zero-phase filter like cool edit's FFT, there will be a (probably inaudible) quality boost.
Even though careful digital EQ can be more phase-accurate than an analogue preamp's EQ, the phase accuracy of an LP is so poor that the difference is academic and of no practical significance. In any case, having to apply RIAA correction after recording is just an extra step that will become tiresome. On balance, it's far simpler to do it in the preamp.
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tone arm should be linear - it tracks better and doesn't do strange things with the inner groove.
In theory linear tracking tonearms should produce less tracing distortion due to geometry errors, but in practice they are devilishly difficult to build well. The number of linear tracking arms that are affordable and work properly can be counted on the fingers of a double amputee. A properly aligned pivoted arm is far more practical.
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cartridge? i'm not sure about that one. if i had the money i'd go for moving coil, but these are quite heavy and may cause problems. besides that, a very good (and lightweight) moving magnet cartridge will give similar performance and wear the record less.
Good moving coils do sound better, but they put additional requirements on the preamp. You should only think about a moving coil cartridge if you've got some serious money to spend on this project. Otherwise you're better off with a decent mid-range moving magnet.
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stylus should be hyperelliptical (mine's spherical, dammit), or if you can find one, get a shibata stylus (i'm not sure if they still make these, but they are designed for discrete-channel quad records, where the rear channels were carried on a modulated tone at 30khz IIRC. this means a shibata stylus can usefully resolve up to 30Khz at least. this is a very good thing)
I doubt anyone still makes genuine shibata stylii. The shibata profile is very specifically designed for CD4 records, which of course are no longer made. As a general rule elliptical stylii give more accurate groove tracing and hence better sound quality, especially in the high end. The more extreme the ellipticity (is that a word?), the better the tracing. These stylii are sometimes called "fine line". But there is a downside: the more elliptical you get, the more critical the cartridge alignment becomes. There is a cut-off point where the inability to accurately align things starts to degrade the sound. Where this cut-off point is depends on the tonearm design and skill of the person doing the setup. I'd avoid stylii that were more extreme than .7 x .2
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however, records are lo-fi, and the lo-fi sound they make has it's own aesthetic, which personally i'm quite fond of. so i wouldn't be worried if your system is less than ideal (like mine...).
In objective sound quality terms, vinyl records are a dog's dinner. But the human ear is a funny thing, and LPs can actually sound pretty damn magnificent if played properly. They were also never subject to the modern hypercompression plague (if you cut an LP with the sort of compression typical on modern CDs, you'd probably get about 5 mins per side), so at least music tends to "breathe" properly when played from an LP (as it does from a well mastered CD, of course).