doctor fuse
Super Member
I've been listening to my Dual 1218 recently, and have been so impressed by not only it's keen rhythm and musciality, but also by it's impressive technical quality (quartz-like speed accuracy and low, inaudible wow and flutter, averaging 0.07% on the app).
Yesterday I used it as a changer for the first time. A couple of times the mechanism failed and the tonearm returned to rest and it shut off, after the record fell.
This morning, wow or flutter is audible. Like one slight pitch fluctuation every rotation (wow?).
I did have the volume set very high, for some reason. Not sure if this is making the speed variation more audible. Orchestra record, no piano.
So I checked the speed with the app, and speed was 33.30 RPM (was set to 33.33 last time I checked, but this is acceptable drift for me), and surprisingly, the W and F registered as 0.08% (readings have come in from 0.06-0.09%, so this is basically the same).
Any idea what is going on? I don't think my ears have suddenly got more sensitive. Can anyone explain how the gyroscope app works, for dummies?
PS. I have checked the accuracy of the speed portion of the app, against my Technics DD SL-D2. With the strobe dead still, the app registers 33.33, so it seems to be accurate for RPM speed measurement.
Yesterday I used it as a changer for the first time. A couple of times the mechanism failed and the tonearm returned to rest and it shut off, after the record fell.
This morning, wow or flutter is audible. Like one slight pitch fluctuation every rotation (wow?).
I did have the volume set very high, for some reason. Not sure if this is making the speed variation more audible. Orchestra record, no piano.
So I checked the speed with the app, and speed was 33.30 RPM (was set to 33.33 last time I checked, but this is acceptable drift for me), and surprisingly, the W and F registered as 0.08% (readings have come in from 0.06-0.09%, so this is basically the same).
Any idea what is going on? I don't think my ears have suddenly got more sensitive. Can anyone explain how the gyroscope app works, for dummies?
PS. I have checked the accuracy of the speed portion of the app, against my Technics DD SL-D2. With the strobe dead still, the app registers 33.33, so it seems to be accurate for RPM speed measurement.