I ve just seen the new funkfirm motor which seems to be compatible with every subchassis. Are there some experiences? Did someone made some comparison?
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Interesting, just looked it up. My initial reaction is I cannot see the logic. Surely the motor vibration is better the other side of the rubber belt, not directly attached to the platter.
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This isn’t that much different from what Arthur Khoubesserian did at Pink Triangle some thirty years ago. My Pink Anniversary had a pitch stability far better than the LP 12 it replaced. Motor noise wasn’t an issue back then, most likely it won’t be with the Funk motor now.
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At what level will be the motor itself? Radikal?
Any answer from me would be a complete guess and I’d prefer to stay with knowledge. I can relate to the idea of the belt interfering with the subchassis action. Balancing a subchassis on or from springs is doable and will give a controlled up and down movement. The belt will add a sideways pull to the system that can only cause problems. Putting a noisy motor on the subchassis will create a problem, too. As with many things in HiFi, there is no perfect solution, only different approaches to it.
With 110/220 V motors lp12, the lateral traction exerted by the belt depended on the angle of inclination of the pulley. It was often easy to achieve precise speed adjustment by tilting the pulley and thus the motor shaft, which operated at a certain angle; however, depending on the angle, the behaviour of the motor and its drive shaft generated play with micro-irregularities in belt tension and transmitted vibrations. When the pulley and motor shaft were positioned vertically without any tilt, fine speed adjustment was achieved by correctly orienting the springs and centring the arm support plate, resulting in less motor vibration, stabilised belt tension, and low tension on the plate without any rocking effect on the springs.
Now, thanks to the speed precision provided by a tachometer, the pulleys are no longer tiltable, rotation is precise, the belts remain stable in height and tension, the springs remain immobile in the lateral axis, and the platter rotates without oscillation.