Jazdoc
I agree totally with you. There are many other important parameters that must be addressed in a TT design
To state the obvious. A complete TT assembly including arm and cart is a machine that measures tiny movement with respect to time.
Over the years I have built maybe 10 TTs from the ground up, BD and DD. plus a few arms.
The conclusions drawn from this experience which parallels much written in the various forums here is this. If we are seeking the unatainable goal of perfection a TT must..,,
1) have absolute speed stability under all load conditions.
2) have absolute dimensional stability between platter and arm support.
3) be absolutely still, with total immunity from external movement.
Obviously there are other considerations, but these seem to be the core requirements
For example we would fail requirement 2) if there was any bearing noise, as this would cause dimensional instability since it would be moving the platter about.
Ct0517 the TT under test was a Goldmund studio with a Syrinx PU3 arm and I think a Monster 2000 MC cartridge.
I agree it was an astonishing finding which clearly demonstrated the effect of stylus drag. I hasten to add that I am in no way criticizing the Goldmund. It was simply correctly doing what it was designed to do. From memory it had a 2.5 kg platter with lead weights around its circumference. Thus for its weight, the platter had a relatively high moment of inertia.
The conclusion drawn from this test however would indicate that some form of real time speed monitoring and correction regardless of drive method, should be employed if we are to satisfy condition 1)
It is up to the listener to decide if this level of speed stability is necessary and can be engineered in such a way as to be benign.
For me the answer is yes and yes.
I agree totally with you. There are many other important parameters that must be addressed in a TT design
To state the obvious. A complete TT assembly including arm and cart is a machine that measures tiny movement with respect to time.
Over the years I have built maybe 10 TTs from the ground up, BD and DD. plus a few arms.
The conclusions drawn from this experience which parallels much written in the various forums here is this. If we are seeking the unatainable goal of perfection a TT must..,,
1) have absolute speed stability under all load conditions.
2) have absolute dimensional stability between platter and arm support.
3) be absolutely still, with total immunity from external movement.
Obviously there are other considerations, but these seem to be the core requirements
For example we would fail requirement 2) if there was any bearing noise, as this would cause dimensional instability since it would be moving the platter about.
Ct0517 the TT under test was a Goldmund studio with a Syrinx PU3 arm and I think a Monster 2000 MC cartridge.
I agree it was an astonishing finding which clearly demonstrated the effect of stylus drag. I hasten to add that I am in no way criticizing the Goldmund. It was simply correctly doing what it was designed to do. From memory it had a 2.5 kg platter with lead weights around its circumference. Thus for its weight, the platter had a relatively high moment of inertia.
The conclusion drawn from this test however would indicate that some form of real time speed monitoring and correction regardless of drive method, should be employed if we are to satisfy condition 1)
It is up to the listener to decide if this level of speed stability is necessary and can be engineered in such a way as to be benign.
For me the answer is yes and yes.
