Hello asb,
This might end up being a long email. Are you also having trouble with you Ront/motor?
I am always amazed at the amount of intelligence expressed on this forum. As an example, exupgh12, you might have been correct by suggesting it might be a problem with the motor drive circuit.
I spoke to Mathias at Brinkman. He suggested that I contact Soren Wittrup who is the authorized Brinkman repairman for The USA and Canada.
From my limited experience, Soren is an electrical, repair genius. He also repairs other high end audio products.
I first sent just my Ront only back to Soren, even though I asked him if he wanted my motor sent at the same time. He said, "no need". He found problems with my Ront, corrected the problems, tested for quite a while at his shop and all seemed to be fine. Yes, "seemed" is the operative word here. I installed my Ront back into my system and had the same problem. It would not power my Spyder, but of course the bearing heater continued to work and power the turntable.
After another long talk with Soren, he suggested that I send my motor, with the Ront this time. Yes, that Pabst(?) motor that nothing ever happens to, that can outlast all of us. Anyway, Soren did find something wrong with the motor drive circuit! It was either a capacitor or resister within the circuit. Soren made it clear that there is nothing wrong with the basic motor itself. And, at this time, the repairs that he made to The Ront are still working properly.
Here is the kicker. This exact problem has happened to (according to Soren) six other motors that he knows about. Soren continued to say that this single capacitor or resister was chosen by The Brinkman engineers for its specific "sound". Hmmmm...possibly. This specific part is nos and Soren has suggested to Mathias that a new part would be more reliable for this specific application. But Mathias says that by using the nos part, he thinks that it makes a difference in the sound of the t/t...I guess that is possible.
Here is the (almost) end result. Soren at this time, has traveled back to Belgium, for a couple of weeks, apparently, he has a close contact with Mathias there and is bringing back "a new board" for my motor from Brinkman itself. He will be speaking to Mathias about this specific problem.
So, that is the long and short of this problem. asb, I will post what the end result is, if you are still interested. But Soren seems to have the problem in hand. Personally, I am amazed that someone not involved in the circuit design of the motor has a better design idea then the men who designed all of the original circuitry.
Mark