[Coco] Audio recording on CoCo
snhirsch at gmail.com
Mon Nov 21 08:16:32 EST 2011
On Mon, 21 Nov 2011, gene heskett wrote:
> On Monday, November 21, 2011 12:31:59 AM Joel Ewy did opine:
>> On 11/20/2011 09:57 PM, Brian G wrote:
>>> I would like some advice on how to transfer LP music to CD.
>>> What equipment, software is needed? I have a turntable that I have not
>>> used in years, so starting from that, what do I need?
>> Computer with sound card. Preamp to get the LP to line level audio.
>> Cable from preamp to audio in jack on computer's sound card. Some kind
>> of recording software on the PC. Audacity is Free / Open Source, and
>> runs under Linux and I believe Windows and Mac.
> You forgot what is probably the single most important item, the record
> turner, and the 'tone arm' and the cartridge mounted in it. If a magnetic
> cartridge, you will need a preamp that converts the magnetic cartridges
> velocity mode output into an amplitude mode output, commonly call an RIAA
> When records were king, there was no better playback cartridge than the
> Shure RE-15's, but the arm they were mounted in had to be capable of being
> adjusted to 1.5 grams tracking weight, and so friction free it would follow
> the recording groove faithfully at that pressure.
I'll second that recommendation. I used V15s (consumer version of RE15, I
believe) for years. And, yes, they required a "high compliance" arm and
are not something you'd blindly refit to a low-end turntable/arm combo.
IIRC, the V15 had a more delicate stylus and would start to collapse at
about 1.5 grams! The only other cartridge I bonded with was a Dynavector
moving-coil unit, but the stylus eventually was ruined from clumsiness and
the company is long gone.
I recently went through the exercise of digitizing part of my (large) LP
record collection. The cheap phono-to-USB converters I tried were simply
terrible sounding. All the hard-won lessons about analog op-amp
application to audio have been forgotten over the past 30 years or so.
There's nothing more grating on my ears than an audio stage with obvious
slew-rate problems (Walt Jung, where are you?).
Ended up taking the "straight line" output from a high-end pre-amp
(discrete FET input stages - no op-amps!) and running it through a Burwen
analog tick and pop suppressor into the Intel sound chip on my Linux box.
When adjusted properly, the Burwen does a noticably better job of quieting
transient groove noise than the Audacity algorithms. Then, I used
Audacity to clean-up the residual steady-state noise by auto-correlation.
The results are almost indistinguishable from a digital-mastered CD.
I was fortunate enough to have a Technics SL1200Mk2 turntable left over
from a previous life in the audio biz. Which is fortunate, because good
turntables are not easy to acquire anymore without paying stupid prices on
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