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Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Tue Apr 22, 2025 6:44 am
by phonogfp
NEFaurora wrote: Tue Apr 22, 2025 1:28 am
Just to Add a note to this discussion.......Many Edison Diamond Disc Machines were sold with the 10" / 12" Buttons switch attached, but no 10" / 12" Long Play assembly installed. I guess Edison figured that the owner would get curious about the buttons that did literally absolutely nothing when you pressed them, then ask their Edison Dealer then to install the option. (I guess Phonograph Jobbers made House Calls in those days...lol..
). - Tony K. Edison Collector/Restorer, Melbourne, Florida.
The problem with this theory is that the 10"/12" button appeared on machines several years before the LP equipment was offered.
George P.
Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Tue Apr 22, 2025 7:12 am
by MrRom92
drh wrote: Thu Apr 17, 2025 12:02 pm
MrRom92 wrote: Wed Apr 16, 2025 6:24 pm
Upon getting my invoice, I ended up winning one of the other 12” Long Plays in the catalog. Definitely not the Beethoven… but interesting enough.
I’m curious, do you know what the appropriate stylus would be to play this on more modern equipment?
Congrats! As to the stylus, I don't know; I'd consult with Expert Stylus in England.
I reached out to Expert Stylus Co. and just heard back, they suggested and offered a .0015" FCR diamond for Edison LP playback.
I’m actually surprised by this as I figured the incredibly fine groove of these records would be equivalent to microgroove or perhaps something even smaller
Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Tue Apr 22, 2025 9:34 pm
by Lucius1958
phonogfp wrote: Tue Apr 22, 2025 6:44 am
NEFaurora wrote: Tue Apr 22, 2025 1:28 am
Just to Add a note to this discussion.......Many Edison Diamond Disc Machines were sold with the 10" / 12" Buttons switch attached, but no 10" / 12" Long Play assembly installed. I guess Edison figured that the owner would get curious about the buttons that did literally absolutely nothing when you pressed them, then ask their Edison Dealer then to install the option. (I guess Phonograph Jobbers made House Calls in those days...lol..
). - Tony K. Edison Collector/Restorer, Melbourne, Florida.
The problem with this theory is that the 10"/12" button appeared on machines several years before the LP equipment was offered.
George P.
Edison had envisioned 12" DDs since the outset; hence the phonographs were outfitted with 12" turntables. There was another attempt to revive the format around 1922; my very early BC-34 has the buttons.
- Bill
Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Wed Apr 23, 2025 7:23 am
by phonogfp
MrRom92 wrote: Tue Apr 22, 2025 7:12 am
I reached out to Expert Stylus Co. and just heard back, they suggested and offered a .0015" FCR diamond for Edison LP playback.
I’m actually surprised by this as I figured the incredibly fine groove of these records would be equivalent to microgroove or perhaps something even smaller
I seem to recall reading in period Edison literature that the LPs were manufactured with 450 tpi.
George P.
Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Wed Apr 23, 2025 2:55 pm
by MrRom92
phonogfp wrote: Wed Apr 23, 2025 7:23 am
MrRom92 wrote: Tue Apr 22, 2025 7:12 am
I reached out to Expert Stylus Co. and just heard back, they suggested and offered a .0015" FCR diamond for Edison LP playback.
I’m actually surprised by this as I figured the incredibly fine groove of these records would be equivalent to microgroove or perhaps something even smaller
I seem to recall reading in period Edison literature that the LPs were manufactured with 450 tpi.
George P.
Yes, although this doesn’t necessarily correlate with a smaller groove dimension, it certainly suggests that one may have been used. The LPI of a typical modern LP is much lower than that, often by half or even less.
Re: Adding a long play mechanism to a Diamond Disc phonograph
Posted: Thu Apr 24, 2025 11:30 am
by JerryVan
At 450 TPI, the groove width would be .002", which seems to correlate with the recommended .0015" stylus.