I would add that Dave's 3.7mm audiophile mat doesn't give enough range of VTA adjustement with the SME IV, and I would imagine, the 309, because the arm rest gets awfully close to the deck. I've just obtained a 6.1mm Herbies Way Excellent II mat that gives me 2.4mm of extra adjustement range.
My stand is most likely not properly designed
it's a wooden skeletal tripod stand with SDS isolating squares under a nice granite slab. The SDS squares are ver good here.
I've got standard spikes into RDC buttons to the hardwood over concrete floor, and the feet on the TT are Soundhifi feet ones. I was looking at other choices but haven't gone for the isonoes, yet. The blurb says the harder the surface the better they work. Can't get much harder than granite.
Had shivers all over with the Steve Young version of "The Night they drove Old Dixie down".
Intel NUC/Chevron Audio NDF16 dac/Amptastic Mini-1/Audium Comp 5
Mains Block: Custom-HiFi-Cables PowerBlack Distribution Block (with super conditioner).
Connected with Reference Fidelity Components Super Neptunes and Speaker Cables.
Powered by Custom-HiFi-Cables DC2 psus