78's from my Grandmas

[Dude111]

Originally posted by Electronic M
The Edison discs can be safely played on a stereo cartridge (light tracking force is recommended). Any mono playback device that isn't a Edison diamond disc phono should NEVER be used to play a Edison diamond disc.

I have only listend to my 78s on my mono player.... I havent played the thick edisons.. I only have played those on my stereo crosley player....

I didnt know a Mono cartridge might hurt a edison record,is that because its so close to the record??

[Electronic M]

Originally Posted by Dude111

I have only listend to my 78s on my mono player.... I havent played the thick edisons.. I only have played those on my stereo crosley player....

I didnt know a Mono cartridge might hurt a edison record,is that because its so close to the record??

You didn't read or understand what was posted earlier did you...
Edison diamond discs were recorded with vertical audio modulation (stylus moves up and down) in the groove. All NON-edison mono players used lateral audio modulation (stylus moves side to side). A lateral pickup can not pickup vertical audio and vice versa.
Stereo pickups are 45-45 stereo the right groove is audio modulated at a 45 degree angle above lateral and the left groove is modulated at a 45 degree angle above lateral. Consequently the left and right modulation are at a 90 degree angle to each other* which prevents cross talk between left and right (similar to how lateral and vertical grooves are at a 90 degree angle to each other and one type cart can't play the other type record)...Also because of this angle a stereo cartridge stylus must be able to move easily both vertically and laterally.

Mono cartridges (especially those made before stereo came out in 1958) usually have poor vertical compliance so if you play a record with vertical modulation components to it such as an Edison diamond disc or a stereo record a mono cartridge (the stylus of which doesn't like to move vertically) the styli will literally erase the vertical modulated music by scraping it off...Some older stereo LPs have warnings on the jacket and or label stating that the record will be damaged if played on mono equipment for this exact reason.

Also if you wire the stereo channels together in the correct manner you can make a stereo cartridge act like a lateral mono or vertical mono cartridge. (Useful when playing a mono record as the unmodulated axis contains only record scratch noise so canceling the unmodulated axis cancells a fair portion of record noise.)

* 2 signals on the same medium encoded at 90 degrees separation to each other is a very useful concept color television uses Quadrature Amplitude Modulation to pack 2 color difference signals into a single chroma signal that's more bandwidth efficient and easier to hide mixing into the monochrome signal...The quadrature in this case meaning 2 radio frequency carriers of the same frequency with a 90 degre phase difference between them each carrying a different modulation signal payload....the 90 degree phase shift prevents crosstalk which keeps the 2 modulation payloads seperate and distinct from each other.

[Hawkwind]

I was under the impression that the flat thick Edison disks were around 60RPM. Also, that they have a wider frequency response. I haven't thought about Edison disks in 50+ years...