If you have it or any info on how to get it.
I've had two freshly rebuilt units on the floor at the same time, same updated parts almost the same bias settings. The standard 50 just did it better. Not a patch on the 200 though..I don't know about the other 'S' models but have to strongly disagree with regards to the 50S.
Please don't make me lug one along tomorrow to prove you wrong