Setting VTA on a new Shelter 901?


I'm trying to dial in a new Shelter 901, knowing I face several dozen hours of break-in before I ought to be too critical.

It's in an SME IV.vi arm on a SOTA Star. The arm has a VTA adjustment dial/rod...but it's not that easy to move, up or downward. Both ways requires loosening some base screws, etc. Not precisely repeatable, either. Nevermind that, my question is...

What's a good "geometry" ballpark to begin VTA tweaking...
cartridge bottom parallel to record? Slightly down at the back? Somebody on Audiogon mentioned slightly down at the front, but that sounds (and looks, in my mind's eye) very scary. But, so far, what do I know?

The cartridge is very, very slightly down in the rear right now, about 1-2° I'd say. Bass seems mostly controlled, but load...treble (strings) are very bright...vocals I'm familiar with seem pretty about right...so far, nothing I'd call warmth. That's some break-up that happens on crescendos...sounds like eggs frying ...seems more like electronic distortion ugliness that mistracking.

Thanks for any help and ideas.

Noel
128x128nnauber
My Shelter 901 took ~80 hrs for break in, it's sound is getting better and better.
I would just set the cartridge in parallel to record until cartridge has at least ~50hrs on it(same for the loading, run it at 47k until cartridge has ~50hrs on it).
Initially, changing VTA did not yield significant changes in the sound. But after break in, I like the sound of it when it is slightly tilted back(very slight) with 1.8gram VTF.

Also I messed around with cartridge loading initially and ended up staying at 47k(becasue before cartridge was broken in, any loading under 10K yielded somewhat of muffled/congested/lack of dynamic). After ~80hrs, I tried the different values again and now I'm running at 200 ohm.
I use a deck of playing cards when setting the VTA on arms that have coarse adjustments like yours. Put the deck under the arm, touching the bearing and lower the arm until it touches the cards. To increase VTA add more cards and lower the arm down on the deck again, to reduce it, just remove some cards. This allows very, very precise control of VTA on even the most persnicity of arms.
The playing card approach is a GREAT idea, Viridian. No dealing off the bottom, though!
Noel,

901, apparently due to its geometry, is very sensitive for VTA. The people who report opposite are just have low discrimination playback systems or hearing. The 901 yields the best result around 1.7-1.9 and for each mass it would require own very precise VTA setting. Unfortunately, due to luck of precise unified VTA measurement, no one would be able to tell you an absolute values for a specific mass. You have to plays with it. The Playing Cards method is very useful however it would not necessary work with 901. The “standart” playing cards are too thick for the 901’s VTA sensitively and you will eventually find the 17 cards is too high but 16 cards it too low… You may search for the thinner cards or to tape on some of the cards 0.1 mm tape (as I do)… Also, you might discover in future that to set VTA according to the system tonal balance (bright, warmth, break-up that happens on crescendos and so on…) is not correct way to search for a correct VTA... Good luck.

Rgs,
Romy the Cat

PS: posted despite a great opportunity that the post will be vandalized by the local “administration”