Once things are stable, say after a couple of minutes, are you getting reading variations as large as .07??? That 33.403 with a 33.333 reference. Also once warmed up how stable is the reading. Once stabalized with a heavy platter and a 3 phase controller, I am getting only .001 variation with tape drive. Having a controller with a rpm adjustment is really nice. Belt tension, bearings warming up etc will change rpm. So you get up to change the lp, move the knob and get real close to 33.333. The road runner is a great tool to have.
Enjoy the ride
Tom
Enjoy the ride
Tom