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Having recently transferred an Edison "80 rpm" disc (one of his long-players), I can tell you the 80 rpm speed may not be exactly right. A good "ear" and an accurate pitch reference for tuning are really necessary, regardless of how the pitch correction is implemented. Doug Pomeroy [log in to unmask] > Date: Mon, 27 Apr 2015 20:14:03 -0400 > From: "Richard L. Hess" <[log in to unmask]> > Subject: Re: Here's a tough one - maybe > > On 2015-04-27 8:45 PM, Paul Stamler wrote: >> On 4/27/2015 2:05 PM, John Haley wrote: >>> Turntables from the 78 era are usually nightmares >>> for rumble, instability, etc. >> >> A big amen to that. Incidentally, a disc meant to play at 80rpm will, if >> played at 78.25rpm (nominal "78" speed) come out with every frequency at >> 0.978125 x what was intended. >> >> Sincea note that's a semitone flat is 0.9439 x the intended frequency, >> that means that an 80rpm disc played at 78.25rpm will be less than a >> semitone off. Still worth correcting. If the frequencies are all >> multiplied by 80/78.125 = 1.0223642, they'll come out right. >