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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. DDR 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. > Best, > 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. > The > >> 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 > >> > >> > >> > -- 1006 Langer Way Delray Beach, FL 33483 212.874.9626