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  #31  
Old 03-26-2018, 12:02 PM
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RCA had a 33 LP record in 1932 not microgroove though and the depression killed it after intro. I. Can see why Sarnoff was livid.
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  #32  
Old 03-26-2018, 04:37 PM
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Quote:
Originally Posted by Electronic M View Post
RCA had a 33 LP record in 1932 not microgroove though and the depression killed it after intro. I. Can see why Sarnoff was livid.
Was that a shellac disc, rather than vinyl? I could picture that dying with or without the depression due to low quality compared to 78s.
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  #33  
Old 03-26-2018, 09:14 PM
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Quote:
Originally Posted by old_tv_nut View Post
Was that a shellac disc, rather than vinyl? I could picture that dying with or without the depression due to low quality compared to 78s.
From Wikipedia https://en.wikipedia.org/wiki/LP_record
Quote:
RCA Victor introduced an early version of a long-playing record for home use in September 1931. These "Program Transcription" discs, as Victor called them, played at ​33 1⁄3 rpm and used a somewhat finer and more closely spaced groove than typical 78s. They were to be played with a special "Chromium Orange" chrome-plated steel needle. The 10-inch discs, mostly used for popular and light classical music, were normally pressed in shellac, but the 12-inch discs, mostly used for "serious" classical music, were normally pressed in Victor's new vinyl-based Victrolac compound, which provided a much quieter playing surface. They could hold up to 15 minutes per side.
Had to look it up. I have a changer mech, but no records of that format. This is the same mech I have: https://www.youtube.com/watch?v=87P7xygDcs0
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  #34  
Old 03-26-2018, 11:53 PM
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Interesting.
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  #35  
Old 03-27-2018, 02:12 PM
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Although these are called "program transcription" discs, they apparently are not the same as the transcription disks used by radio broadcasters, dating back to 1933:

https://en.m.wikipedia.org/wiki/Elec..._transcription

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