As John says, one's ears are the only reliable guide. 500Hz/-16dB was
commonly used, as was 500/-10 or RIAA. However, 400/-12, 400/-16 and
800/-10 were occasionally used. This is why accurate turnover and rolloff
controls are essential on any "archival" preamplifier.
On Wed, Mar 11, 2015 at 3:11 PM, John Haley <[log in to unmask]> wrote:
> Paul, I have dubbed lots of acetates (instantaneous discs) and the phono-EQ
> curve is not predictable. I believe AES came about in about 1951, but NAB
> was fairly widespread. But that's not so useful. You really have to try
> things, including no curve.
> John Haley
> On Mar 11, 2015 2:36 PM, "Tom Fine" <[log in to unmask]> wrote:
> > I would think NAB or AES. See how that sounds. It'll be something in that
> > ballpark if it's from the 1940s and it's not RCA or Decca.
> > -- Tom Fine
> > ----- Original Message ----- From: "Paul Stamler" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Wednesday, March 11, 2015 3:27 PM
> > Subject: [ARSCLIST] De-emphasis for acetate discs?
> > Hi folks:
> >> What de-emphasis curve is a good choice for acetate discs? I have six 78
> >> rpm sides by a gospel quartet here, recorded in 1946 at a local studio.
> >> discs are Presto, but of course that's no guarantee that the disc cutter
> >> was also a Presto.
> >> Anyway, I'm wondering what a good curve would be as a starting point?
> >> NAB?
> >> Peace,
> >> Paul
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