Solong your experiences with the Raven are flabbergasting. My Final Audio Parthenon, built in the 70's, using an AC motor/20kg platter, has infinite control of speed at both 33 & 45, and the amount of torque applied to the motor is fully adjustable to optimise speed stability and minimise motor vibration.
The real killer though is that I have a Thorens TD126mk2 that I use for 78's also built in the 70's - this has a wein bridge oscillator speed control & rubber belt as standard and it can hold speed accurately, even when putting the 1.8kg record stabiliser from the Final Audio on there was no speed adjustment required and the speed holds.
It just makes you wonder whether the advent of digital controllers in modern motor technology is simply not good enough for audio.
The real killer though is that I have a Thorens TD126mk2 that I use for 78's also built in the 70's - this has a wein bridge oscillator speed control & rubber belt as standard and it can hold speed accurately, even when putting the 1.8kg record stabiliser from the Final Audio on there was no speed adjustment required and the speed holds.
It just makes you wonder whether the advent of digital controllers in modern motor technology is simply not good enough for audio.