I don't know the exact answer, but I suggest you pitch every record
individually in Sound Forge. How to figure this out--music goes up an
octave when the playing speed is doubled, or drops an octave when the speed
is cut in half. So the pitch won't be too far off comparing 78 to 80. Of
course little changes in pitch are very important to how it sounds.

If you are serious about transferring 78's, you really might want to get a
more modern turntable. Turntables from the 78 era are usually nightmares
for rumble, instability, etc.

Best,
John Haley

On Mon, Apr 27, 2015 at 2:52 PM, James Roth <[log in to unmask]> wrote:

> Hello everyone
>
> I have a turntable that goes only 78, and even though I have an Edison
> stylus and a cartridge wired for vertical grooves, I can't spin the disk at
> 80.
> So, the question is, how many half-tones do I have to raise the music in
> my Sony Sound Forge program to bring the music to the proper pitch?
>
> Thanks
> Ben Roth
>
>