I have owned a few shelter cartridges over the years never been my thing, I dont get on with lyras what so ever. Koetsus have changed very much over the years they are not the warm lush cartridges they once were. I have had many of them from the 80,s to date they also are a bit inconsistent I have a heard two same models sound very different. I did hear a very nice 2018 Red Sig recently at a friends sound fresh not slow and boring with great bass and plenty of slam something you dont often expect from a Koetsu. The stone bodies are in a different class each body does sound very different then you get into the super big league 11.5k diamond cantilever versions that can be jaw dropping good. If using a 310 I would use the sme spacer as it adds extra mass and does work well with the koetsu I likes the older aluminium 310 with koetsus they sounded very much more vibrant than the later arm tubes.
I like the dynavectors mentioned earlier they are good honest nice sounding cartridges and generally seem to be quite consistent with samples while maybe not as consistent by ortofons standards that said I owned four MC Ana cartridges because of reliabilty and inconsistency issues. If one has a tonearm that accepts a SPU than they get my overall vote for best bang for your buck. I recently recommended a friend to purchase a Sme M9R with a Spu over a 310 that I have for his Michell Gyro overall he felt he got much more value for money sadly the M9R is not so popular but for me its a great way to get a lot of sound for your pound with a SPU without faffing around looking for audio perfection In a world over populated by rather thin bright sounding overpriced cartridges not to that they are some wonderful gems out there.
Most important and used Walker Black Diamond Etsuro Gold, Micro Seiki 8000mk2 Kondo special V12 Tiger Eye, Fidelity Research FR 66 Shindo spu, EMT 927, sme 312 aluminium. Fidelity research fr66, Sme 3012 mk1, Sme V, Ikeda 407 IT Sme Model 30/2/Dynavector 507 Kodo Beat Turntable Airtangent 10B modified Fidelity fr66s Etsuro Cartridge . Kondo Gakuoh Mk1 powers G70 Pre,Audio Tekne TFA-8695PCS pre Audio Tekne TEA 8695 Phono. Lfd Battery Phono Stage heavily custom rebuilt by Dr Richard Bews, Tharx Phono Stage. Lfd Master Dual Biamp power amp, Lfd Anniversary master preamp. Shindo Latour Field Coil. Rockport Cygnus Biamped, Voigt Domestic Corner Horns/ Feastex Fildcoils. LFD Custom silver Ribbons. LFD Diamond Vipor Mk2 interconnects, Lfd Golden Cobra interconnect. Koetsu blue lace mono special order, Koetsu burma jade mono special order.