Also, I just found out I have about 50 Edison Diamond Discs . Unlike normal records that modulate side-to-side, these record up and down.....C

I remember the old ceramic cartridges had two-sided needles that flipped over for 33/45 and 78 RPM operation. I assumed the issue was groove width, but never looked into that either. Do you know if that's the difference? If not, do you know what is?

I finally decided to digitize my 78s. This gives me a chance to see what kind of sound I get and do a little cleanup to make it listenable. When I look at the waveform and listen to Jazz, Bing Crosby or even Elvis 78s it seems that the equlization is different on all of them. There is stuff on the web about equlization curves by manufacturer, year and artist for 78s but I usually wind up winging it. You just have to do it yourself. expect a base boost of 5 DB and a high end cutoff at 8 to 12 kHz. I use web information on the “proper” equalization only as a general guide.

Anyway I did do a few web pages on this subject for what it’s worth:

some 78 stuff but it's real old and real bad:

http://dvautier.home.comcast.net/records/records.htm

and some more general stuff that's better:

http://dvautier.home.comcast.net/audio/audio.htm

and maybe a little LP stuff:

http://dvautier.home.comcast.net/lp/lp.htm