phillip holmes wrote:
What kind of cartridge do you use?  You could buy several different 
stylus tips to experiment with.
Mono LPs were cut with a wider groove, so that a microgroove stylus will 
ride much further down in the groove than it should.
The width of the cut varied widely over the years and over the labels. It 
is quite common to need a 78-rpm stylus for EMI LPs even into the very 
early stereo era; in contrast, even the early (US) Columbias can be played 
well with a modern elliptical stylus for 33s.
The ability to de-warp a recording depends on the vinyl used. RCA's 
Dynagroove recordings seem to defy attempts to apply pressure when warm. 
Of course, their deliberate distortion adds to the problem of getting an 
acceptable result. Still worse, it appears from the reissues that the 
distortions are inherent in the master tapes.
Mike
--
mrichter@xxxxxxx
http://www.mrichter.com/