El- I haven't been letting the platter come to a complete stop before switching back on. Motor noise differential seems to be most apparent immediately after switching motor off and again when the motor is turned on, so there is not much of a need to have the motor off for more that a second or two. I can usually cycle this test 2 to 3 times between tracks.
After adjusting belt tension using this method (adjuust to least amount of noise through speakers) one can discern the difference between electrical and mechanical noises in the motor/drive system and then fix whatever is causing it. One can also test various belt materials for differences in noise.
After a couple of hours of experimenting, I'm now using the OL DC motor and a #4 silk beading thread and have been able to reduce motor/drive noise to virtually imperceptable while minimizing belt slippage. (Automotive fan belt dressing seemed to improve "traction", too!) Background is blacker and presentation is much more dynamic as a result.
Now I'm on to fine-tuning the arm/cartridge alignment.....
After adjusting belt tension using this method (adjuust to least amount of noise through speakers) one can discern the difference between electrical and mechanical noises in the motor/drive system and then fix whatever is causing it. One can also test various belt materials for differences in noise.
After a couple of hours of experimenting, I'm now using the OL DC motor and a #4 silk beading thread and have been able to reduce motor/drive noise to virtually imperceptable while minimizing belt slippage. (Automotive fan belt dressing seemed to improve "traction", too!) Background is blacker and presentation is much more dynamic as a result.
Now I'm on to fine-tuning the arm/cartridge alignment.....