[78-L] 17 1/2" transcription blanks

[David Weiner]

And I just got several early  RCA 45 7-inch master tests that were cut on
10-inch blanks, dated December 1948.  When were the first 45s issued?

Dave Weiner

On 7/29/12 11:34 AM, "David Lennick" <dlennick at sympatico.ca> wrote:

>These were required for cutting a 16-inch master from which pressings
>were to 
>be made, leaving room to handle the disc when processing. Oversized discs
>were 
>also used for 12" and 10". I have a 14" disc that contains a 10-inch
>78RPM 
>master, dating from about 1947.
>
>dl
>
>On 7/29/2012 11:27 AM, Dennis Flannigan wrote:
>> Just noticed, my blank transcription discs are 17&  1/2 inches across.
>>Is
>> this a particular brand, and where they used differently than the 16"
>>discs?
>>
>> Thank you,
>>
>> df
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