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Michael, are you saying that 78s manufactured in Europe play at a different correct speed than 78's manufactured in the US? I have never heard anything like that before. Best, John On Mon, May 1, 2017 at 9:48 AM, Michael Shoshani <[log in to unmask] > wrote: > Hi Gary, > > While the KAB Speed Strobe works independently of the power line frequency, > and thus works equally well in 60 Hz and 50 Hz countries in theory, I would > submit that in practice it is still geared to the speeds provided on 60 Hz > turntables, which means that electrically recorded 78s from Europe will be > off. > > Its specs indicate 78.26 for 78rpm, which is the 60Hz standard; > Electrically recorded 78s from countries where 50Hz is the power frequency > are recorded at 77.92 RPM. Anyone in the UK or Europe, for example, who > uses the SpeedStrobe to set their turntables at 78, will be playing their > locally manufactured records at a speed 0.44% faster than they should be - > a slightly greater pitching error than the 0.42% Caruso one. (The > SpeedStrobe does not offer 77.92, which seems an amazing oversight for a > product intended for worldwide use.) > > Michael Shoshani > Chicago > > > On Thu, Apr 27, 2017 at 2:40 PM, Gary A. Galo <[log in to unmask]> wrote: > > > Hi George, > > > > Following Aida Favia-Artsay, the difference between 76.60 (60Hz) and > 76.92 > > (50Hz) is 0.42%. This is an unacceptable pitching error. Are you telling > me > > that every 76.6-rpm Caruso record pitched using her 50 Hz strobe will be > > 0.42% off? > > > > It would seem that, for turntables lacking a digital readout, a sensible > > solution is KAB's Speed Strobe: > > > > http://www.kabusa.com/strobe.htm > > > > The Speed Strobe comes with its own LED lamp, which is illuminated with a > > quartz-locked AC signal. Therefore, it is not dependent on the power line > > frequency, and will work equally well in 60 Hz and 50 Hz countries. > > > > Gary > > > > > > >