Subject: Re: [linux-audio-user] [OT] recording fom turntable (ripping LPs)
From: Daniel James (daniel_AT_mondodesigno.com)
Date: Tue May 04 2004 - 14:31:11 EEST
> you need to reverse the RIAA curve to get
> back the original signal.
Audacity has a built in 'equalization' effect with presets for several
disc cutting curves, including RIAA. I'm not sure how you would use
it to reverse the curve though - it looks like it was designed to add
vinyl/shellac equalisation to digital recordings, rather than remove
it from analogue ones recorded without a correcting pre-amp.
The alternative for early recordings is to use an old-school pre-amp
with analogue settings for the different curves used before RIAA
became standard, such as a Leak Varislope:
http://home.mira.net/~kiewavly/Leak/VarislopeII_front_a.jpg
You need two for stereo, and because most Leak stuff is 'collectable'
they are often sold for high prices. They weren't exactly cheap back
in the 1950's though.
I sold my mono Varislope, and these days I use a Musical Fidelity
X-LPS for everything, because I now have a modern pickup cartridge
designed for 78s (an Ortofon) as well as another for 33/45s. The
sound of the 78s probably isn't
http://emedia.leeward.hawaii.edu/frary/x-lp_review.htm
These units are discontinued now, and you can pick them up quite
cheaply from 'end of line' hi-fi dealers - mine cost £100. They go
for more on eBay than the brand new price, so watch out for that!
Cheers
Daniel
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