[78-L] constant velocity records, was Value of 78's

[Eric Jacobs]

> has anyone ever figured out a speed change formula for transferring a 
> constant velocity record?
>
> Or is it dependent on the record size or something?

The formula is a function of: (1) CAV playback speed, (2) inner groove
diameter, and (3) outer groove diameter.  Choice of CAV playback speed
is an important factor when it comes to the audio quality of the
transfer.

We've reverse engineered a number of CLV dictation machines (like the 
Gray Audograph) in order to validate the formulas, and then transferred 
dozens of CLV discs - mostly dictations and spoken word - but the 
formulas would be the same for music recordings.

Eric Jacobs

The Audio Archive, Inc.
tel: 408.221.2128
fax: 408.549.9867
mailto:EricJ at TheAudioArchive.com
http://www.TheAudioArchive.com
Disc and Tape Audio Transfer Services and Preservation Consulting