i found and installed one of these kits, and it works fine on the 10" LPs i have - i don't have any 12" tho.
the installation instructions are excellently written, and as i went through the process i felt a great connection to the writer across all those years. it was a cool experience. the directions are quite explicit about the need for a 2-spring motor, and altho i'm too lazy to check right now, i believe all DD motors were able to have a second spring barrel installed without modification...and that the barrel was available separately for the purpose of the conversion. On May 4, 2006, at 1:02 PM, Robert Wright wrote: > So how did Edison expect consumers to play his LP's if the LP > conversion > kits only geared down the feedscrew of existing DD machines? I > know DD > springs can hold a lot, but I've never seen one play for 24 minutes > (roughly > 5 DD's without winding), much less 40 (as the 12" LP's ran). Did > the LP kit > include an additional or larger spring? > > > > > ----- Original Message ----- > From: "Doug" <cdh...@earthlink.net> >> It's simple when goven a bit of thought. Sure, you can gear down a >> spring >> motor, but the governor has to run at high speed to remain reasonably >> smooth. This means that you use up all of your spring, keeping the > governor >> going, while the turntable runs at slow speed. Under those >> conditions, a >> long playing record will play less than half the playing time on the >> phonograph before you run out of spring. The listener would be >> cranking > the >> motor several times before a 33 1/3 RPM disc could finish playing. >> That >> wouldn't go over well with customers at all! It would explain the >> reason >> that Edison used 80 RPM for his long play records. We might say >> that he > had >> half of the puzzle solved, but he didn't go to slow playing speed >> because >> it wasn't practical with a spring motor. > _______________________________________________ > Phono-L mailing list > Phono-L@oldcrank.org > > Phono-L Archive > http://phono-l.oldcrank.org/archive/ > > Support Phono-L > http://www.cafepress.com/oldcrank
