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Strange Diamond Disc Mystery Record

Posted: Fri Dec 12, 2014 8:44 pm
by Curt A
What is this? A one-sided Diamond Disc with the recording of a single tone??? Matrix #3342-B-1-1

Re: Strange Diamond Disc Mystery Record

Posted: Fri Dec 12, 2014 8:47 pm
by 52089
That would be the "tuning" disc sent to dealers to help regulate the speed of a Diamond Disc machine. This was sent out with a pitch pipe. The dealer would play the record, blow the pipe, and adjust the speed of the record to match the pitch pipe frequency. These don't show up every day.

Re: Strange Diamond Disc Mystery Record

Posted: Fri Dec 12, 2014 9:08 pm
by Curt A
Thanks for the info... how unusual are these?

Re: Strange Diamond Disc Mystery Record

Posted: Fri Dec 12, 2014 9:58 pm
by 52089
Curt A wrote:Thanks for the info... how unusual are these?
I'd say I see 1-2 a year on ebay - at the most.

Re: Strange Diamond Disc Mystery Record

Posted: Sat Dec 13, 2014 10:19 am
by estott
Is the pitch indicated so that you can use a standard pitch pipe?

Re: Strange Diamond Disc Mystery Record

Posted: Sat Dec 13, 2014 11:41 am
by 52089
estott wrote:Is the pitch indicated so that you can use a standard pitch pipe?
The hard-to-find sleeve for the record indicates you should use an "international A Pitch-pipe". I'm not sure what that would be in 1913 - 440? 448?

Re: Strange Diamond Disc Mystery Record

Posted: Sat Dec 13, 2014 6:54 pm
by pictureroll
Most probably A-435.

Re: Strange Diamond Disc Mystery Record

Posted: Sat Dec 13, 2014 8:24 pm
by 52089
Apparently this was discussed earlier:

http://forum.talkingmachine.info/viewto ... ing+record