Rare Edison 10007 Long Play 24 minute 80rpm disc
$
129
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Description
<h2>Rare Edison 10007 Long Play 24 minute 80rpm disc</h2> In 45 years of collecting never came across this before, must have been very limited edition The Edison LPs were indeed microgroove. At 450 lines per inch (LPI) pitch, they are a finer pitch than most modern vinyl LPs. It's no wonder the Edison LPs were a commercial disaster - it's very difficult to mold modern LPs with this fine pitch, never mind trying to play them with a heavy acoustic reproducer. By the way, Edison invented the commercial microgroove record back in 1908 with the first wax amberols at 200 LPI pitch. Modern vinyl LPs average about this same pitch. Which makes 450 LPI super-microgroove. And RCA introduced the 33-1/3rpm speed to consumers in 1931 (it had been in use by professional users even earlier). And plastic record materials including *Vitrolac* and vinyl were already in use by the postwar era in 78 production. All of which is to lay to rest the claim that Columbia *invented* the vinyl LP record in 1948. All they did was piece together several much older technologies.
Interestingly, like the Edisons, the earliest Columbia LPs were also dubs of earlier 78s with several records played sequentially into the LP recorder to make one LP side. Magnetic tape had not come into widespread use for mastering recordings yet (the USA had only recently *liberated* the technology from the Germans in WWII), so new LP recordings would have required the talent to perform continuously and flawlessly over the duration of the record side, a difficult feat to accomplish. Many of the early RCA LPs from the 1930s were labelled as *program transcriptions* and they were, indeed, direct recordings of full lengthy performances - clams and all.
moderate scratches. VG cond. check out site for grading descriptions http://recordsmith.com/rs78.html
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