Has anyone had trouble with speed on their tt


I was having trouble with speed stability on a very expensive dual DC motor top of the line system of a well known brand from England. It was a terrible fight for years, I would get some good days and then the temperamental thing would drift or even radically switch speeds ending my listening session. I now have the perfect system and wondered if we could discuss this for other audio enthusiasts' sake.
zenbret
Kiddman says:

Everyone thinks they have great speed stability in their turntables until they hear one that does, then they wonder why the stable one is so clear, so natural, so right.
Which tables have great speed stability -- which are the best out there?
Drubin,

It's a vicious circle. We have yet to define speed stability. There seem to be various camps when it comes to the finer points of that definition.

I'll say this much; I believe it is a relatively narrow field.
Syntex has some good insight on the subject , but first ill ask, is it no wonder some have gravitated back to using the very best of vintage tables.
Syntax's comment which also crossed my mind , he said "Some inexperience manufactures simply did not do their research and home work, how true.
My $17,000.00 up front turned into 10 months of frustration , two motor controllers later including a check of both motors themselves just to end taking a hit when I sold it, inconsistent speeds were not the only issue , that was evident with my favourite Lps.
However I must take blame of course for believing owner testimonials which convinced me to jump in with both feet,..

Reliability issues are more common then some think however there are other forces at work.
stick with a design that has an AC synchronous motor and a platter heavy enough to have some flywheel effect.

The only time I had serious issues with my table's speed was in the week immediately after Hurricane Sandy. Once my home had power restored things were better.
We have yet to define speed stability.
Glad to see someone acknowledging the complexity. The definition is actually simple. What's infinitely complex is the number of different time periods across which speed stability must be maintained - simultaneously - to assure musically accurate reproduction. This is routinely glossed over in discussions of speed stability.

No strobe (Timeline or otherwise) operates in short enough increments of time to detect micro-/pico-/nano-second variations. Knowing that a TT is speed stable across a time span of minutes tells us nothing about how stable or unstable it may be across a few thousandths or millionths of a second. Such short-period variations are just as audible and musically important, arguably more so.

The Timeline whoopla only considers speed stability across relatively lengthy time periods. While not insignificant, this ignores short-period speed stability issues that are more significant - at least to my ears. Its a bit of a tempest in a teacup.