Blackbird / SME

Viridian I would tend to trust SME's specs more than Analog Classics
Chatter is a figment of some peoples minds for some reason. I doubt this can happen even with loose bearing races. Forget about tapping the arm tube. Tap the cartridge body. If that rings you have a problem. Yes, a stiff cartridge might reflect a little more energy but actually unless the cartridge body weights less than than the effective mass of the diamond and cantilever extraordinarily little energy is reflected back to the arm. In reality the effective mass of the diamond and cantilever are so low in a modern cartridge in relation to the mass of the cartridge I would be surprised if the arm see's any energy other than the linear force that moves the arm across the record. I love these myths perpetrated by people who think they know what they are talking about. Unfortunately, these myths frequently get wings because they seem to make sense.
Beware of people who seem to make sense. 
Viridian I am 65 and have own over twenty tonearms. I never bothered to count and at least twice as many cartridges all the way back to 1965. 
OK Viridian now it is your turn. Prove to us that a tonearm can chatter and we want to know exactly how you determined this and we want to see the data.

MI:

The SME data @ Analog Classics is correct and the OP’s arm with non-detachable HS has an effective mass of 6.5 grams in its standard configuration.

I’ve seen (WWW) what seems to be a scan of an SME info sheet with incorrect figures, and this has been well researched in the past by others as well as myself.

I have been using SME arms from 1971 to present and in that I am not too young (62) or too old (65) my opinion rules.

This said, the OP’s combo does work "on paper" if the knife bearings condition and the setup are both tip-top.

Edit" Whoosh, just noted that the OP's deck is the same as my current Thorens/125II.

DeKay

Viridian, experience is everything in this life. Yes I am old and have had a lot of tonearms which does not explain you backing out of an argument because you have no idea what you are talking about and are intensionally misleading everyone in this forum. It is people like you that make having intelligent conversations almost impossible. Again, where is your proof that knife edge bearings chatter. I'll tell you where it is. Only in hearsay. 
Thanx dekay. Is this SME's data and why should I believe Analog Classic's data? How are they measuring EM? 
There is only one way to set up a tonearm, Tip Top. Oh and 62 is much stupider than 65. You are not even on Medicare yet:)

MI:

The investigation into the contradicting SME spec's took place both here and @ AudioAsylumn years ago and AC's data was proven to be correct.

You might want to research Medicare as well considering that I have been covered by such since 2009 (details, details, details).

DeKay