Convert older turntable to USB? - AVS Forum
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post #1 of 12 Old 01-10-2011, 10:46 AM - Thread Starter
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I have an older, high quality Technics turntable from my "audiophile" days, and it's been carefully wrapped and stored for a few years. Got the bright idea that maybe I could rewire or adapt it to interface with my iMac. I figure there are two possibilities; the first is a simple (and hopefully cheap) PnP adapter... I'm picturing a USB at one end and Right/Left RCA jacks at the other. Sounds like a $5.00 component if that. The other approach is to pull the old RCA audio cables out and solder/crimp in a extra USB cable... if that's possible.

Obviously I'm looking for $5-$10 solution... not a $50 one LOL.

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post #2 of 12 Old 01-10-2011, 11:22 AM
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Um, no. Turntables output an analog signal. USB is digital. So you need, at the very least, a digital converter in the chain. You also need a phono preamp before the digital conversion. I'd say you're looking at $100 minimum.

But doesn't your iMac have an audio in port? It should, unless it's an older model. In that case, all you'd need are the phono preamp ($50) and a y-cable ($5).

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post #3 of 12 Old 01-10-2011, 11:27 AM
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Originally Posted by mcnarus View Post

Um, no. Turntables output an analog signal. USB is digital. So you need, at the very least, a digital converter in the chain. You also need a phono preamp before the digital conversion. I'd say you're looking at $100 minimum.

But doesn't your iMac have an audio in port? It should, unless it's an older model. In that case, all you'd need are the phono preamp ($50) and a y-cable ($5).

+1 .. phono preamp + Y Cable L/R RCA to Mini Plug + Download Audacity Free ..

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post #4 of 12 Old 01-10-2011, 11:36 AM
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You need phono preamp (CA Azur 540P) and A/D controller with USB interface (E-MU 0404USB) . You can get good quality from about $300 investment. And since you kept TT unused for a long time, I would also suggest to replace cartridge (Shure M97xE).
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post #5 of 12 Old 01-10-2011, 02:13 PM - Thread Starter
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OK, so I need a preamp of some sort to build the audio up, then some sort of cable adapter to make the RCA's into a mini. I haven't even unpacked it yet, but the cartridge that's in the Technics is not what it came with LOL... probably spent $100 in 1980 dollars on the cartridge and I doubt it degrades over time... but maybe you'll tell me it does?

Thinking I could also run those RCA's into my Yamaha HTR-5360 receiver and maybe I could pipe some of that back through the system when I get my AppleTV and Sony BluRay wired with ethernet.

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post #6 of 12 Old 01-10-2011, 04:33 PM
 
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then some sort of cable adapter to make the RCA's into a mini.

No, as mentioned, you need a soundcard, usb or otherwise, or some other method of digitizing the analog signal from the TT.
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post #7 of 12 Old 01-10-2011, 04:49 PM
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No, as mentioned, you need a soundcard, usb or otherwise, or some other method of digitizing the analog signal from the TT.

The assumption here is that his iMac already has a soundcard.

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post #8 of 12 Old 01-12-2011, 02:36 PM
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Hook up to your TT an NAD PP-3 digital phono stage w/a USB output. Cost is $199. That's about as low as you can go to get a quality feed. NAD has a vg reputation for making affordable phono pre amps. Good hunting.
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post #9 of 12 Old 01-15-2011, 07:21 AM
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Quote:
Originally Posted by IronHorse View Post

OK, so I need a preamp of some sort to build the audio up,

No...not a preamp of some sort. Specifically a "phono preamp" which is a high gain preamp (signal from cartridge is very small with fairly specific capacitive and impedance loading requirements), and also includes the all-important RIAA equalization curve so the raw frequency response from record is appropriately corrected.

Just because there is a knob doesn't mean you should turn it.
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post #10 of 12 Old 01-16-2011, 07:30 AM
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Oh goodness.. this is what you need.



NAD PP 3i Digital Phono Preamplifier

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post #11 of 12 Old 01-16-2011, 09:13 AM
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If you have an old receiver with phono input you can use that as the preamp. You can use the headphone jack on the receiver to output the sound to your computer soundcard. You need a cable from the headphone jack to the input on the soundcard.

Download applicable software and you may record from the turntable to the computer in the format you desire. Cost may be zero if you have cables and an old receiver.

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post #12 of 12 Old 01-16-2011, 11:22 AM
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You can use the headphone jack on the receiver to output the sound to your computer soundcard.

Generally better to use the Tape Out jacks.

If you can't explain how it works, you can't say it doesn't.—The High-End Creed

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