Source: SOTA Star Sapphire III with Fidelity Research FR-64fx arm, Benz Micro Glider L2 cart, and Dynavector P75 phono stage set to "PE" mode for low output MC carts.
No experience with other vinyl rigs or parts, but it handily beats any of the digital sources I've owned - including the Meridian - in both sonics and looks, IMO
Amp: Singlepower SDS w/ a pair of 5687 adaptors.
Still have yet to hear a non-SDS amp equal or beat this one, overall. High or low impedance, it doesn't matter. The 5687 output tube adaptors are essential for driving really hard-to-drive cans like the Grado HP1000 and Sony R10. The R10 still won't reach it's potential without further upgrades, but I don't own that headphone anymore - what a beast to drive!
I'd like to get mine upgraded to higher specs like Purk's (he does own the R10), but that would mean being without it for 1-2 months. The Rudistor RP7b and Melos SHA-Gold Reference get my honorable mention award, but they're more tuned to specific headphones (Melos to the Grado HP2, RS1; Rudistor to the HD650, Qualia, JVC DX1000) and are not quite up to the SDS level overall.
Headphones: Still can't pick just one. The L3000 has always been my favorite for hard rock & metal - that will probably never change. The Qualia 010 are currently my favorite for classical/opera. The HD650 with Zu Mobius is making a strong bid as a potential favorite for pop music.
The L3000, Qualia, and HD650 were all bumped up in performance by vinyl, IMO. The HD650, perhaps, more so - they really seem to open up and sing with vinyl! With my digital sources I'd never considered them in the same performance ballpark as the elite, but they've really surprised me lately.
Tweaks: No serious power conditioning. $90 Bogdan Silver Princess ICs; I got sick of dealing with RCA connectivity issues on the HGA Silver Lace cables - just AWFUL design. A few attenuators in varying values for ensuring accurate L/R channel balance in my system (both cartridges and headphones can have imbalances that may add up). For vinyl care: VPI HW 16.5 record cleaner, TTVJ Gold Zyme, Milty Zerostat gun, Onzow Zerodust stylus cleaner, TTVJ record sleeves - works GREAT!
Upgrades: Please, no more!!! For once I need to sell some of the less used gear to fund MUSIC. It's hard to stop buying vinyl once you've got started. Already to the tune of 75 LPs in the past month.