[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [ARSCLIST] (Fwd) [ARSCLIST] Fwd: Recording Speed
I was most confused by George's reference to "the counter", which
appeared with no explanation that I could find.
It is much simpler than I thought.
Date: Mon, 22 Jun 2009 11:23:26 -0700
From: Michael Biel <mbiel@xxxxxxxxx>
Subject: Re: (Fwd) [ARSCLIST] Fwd: Recording Speed
I understand what George is saying partially because I've seen him
and I am lucky enough to have one of his calibration discs. In case
Doug and others still do not understand it, Doug's snip cut out the
important info and left in material that has no meaning without the
snipped part. =20
In 1982 George commissioned a 7-inch pressing made of a 450 Hz.
at 45.0 RPM. That disc can be played at any RPM and a frequency
will show a reading that is 10 times that RPM. (Play it at 73.7 RPM
it shows 737.0 Hz. 78.26 shows 782.6 Hz. Etc.) If you have a
counter handy, you can find what rotational speed you are using. BUT,
if you include a few seconds of that calibration disc played on the
turntable at the time of your transfer of the record you are
then later on that frequency can be read with a counter and at any
you can establish the rotational speed you used. It's like an audible
strobe disc that has the unique ability to be recorded, and it is as
accurate as your frequency counter is. Sure, you could use a normal
test disc of, say, a 1000 Hz. tone, but George's disc is more directly
readable without using math to have to determine percentage of 1000
whatever tone you used.
Mike Biel mbiel@xxxxxxxxx =20