Two links that might be of use
Tracking force and stylus mentioned here.
The cutting machine is discussed here.
From: Kurt Nauck <[log in to unmask]>
To: [log in to unmask]
Sent: Wednesday, August 24, 2011 10:47 AM
Subject: [ARSCLIST] Speak-O-Phones
Brian and I are working our way through a stack of mid-30s Speak-O-Phone aluminum recordings. Most of these appear to be air checks of dance bands and vocalists.
Condition is pretty good on most of them, but we're having trouble finding the ideal stylus to play them with. Best results seem to be obtained with a standard LP stylus.
Does anyone have any experience with these? (And yes, we're riding the groove, not the landing between them.)
c/o Nauck's Vintage Records
22004 Sherrod Ln.
Spring, TX 77389
E-Mail: [log in to unmask]
Phone: (281) 288-7826
Fax: (425) 930-6862