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Old 29th March 2004, 11:18 AM   #1
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Default Modifying RIAA playback for 78 rpm/45rpm

I keep reading that it is possible to get better results with a variable RIAA playback curve for 78 rpm records. What do they really adjust ? I guess it must be the corner frequencies but by how much ?
Is this also applicable to 45 rpm plaback ?
Anyone on this forum who does these things ? Any sites that I can check out with such information ?
Thanks.
Ashok.
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Old 29th March 2004, 03:59 PM   #2
sreten is offline sreten  United Kingdom
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33 RPM and 45RPM RIAA eq is the same.

78's used lots of different curves.

A MM fitted with a 78 stylus will not be right through a MM input.

Sometimes I think for 78's a ceramic cartridge that does
not require any EQ at all would be the easiest option.

sreten.
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Old 30th March 2004, 09:39 AM   #3
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Read and enjoy: http://www.rfwilmut.clara.net/repro78/repro.html
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Old 30th March 2004, 11:57 AM   #4
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Default Thanks.

Hi Havoc and Sreten,
Thanks for the info. I think that all I wanted.
It has everything that I was looking for.
Thanks again.
Ashok.
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Old 16th January 2007, 02:39 AM   #5
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I run the ceramic 78 RPM output right into my sound card. Then I equalize as needed. when I say "as needed" I mean it. The records are wildly different depending on make, model, year and condition.

I have some web pages on this subject. The discussion under technical page may help. hope so.

http://dvautier.home.comcast.net/records/records.htm

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Old 16th January 2007, 10:23 PM   #6
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Quote:
What do they really adjust ?
We adjust the corners and turn frequencies, just as you thought. 78s were recorded with many (dozens) of equalization curves. There are three main inflection points, one at a low frequency (50Hz for modern RIAA), a mid-band (500Hz), and upper (2122Hz). More info here:

www.hagtech.com/equalization.html

and

www.hagtech.com/pdf/riaa.pdf

I don't believe 45s have this problem, they don't go back as far. But don't quote me on that.

jh
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