I am also using RCA 5751 black plates after a lot of searching. I have used the Tung sol 6x4 as well as my current Ratheoyn 6x4. The sound is wonderful. Very airy, detailed, good solid base. I have thought of upgrading my phono stage because I felt I need to spend more money. The only ones that I have tried that I like better are the BAT 10se, manely steelhead and the aesthetix Rhea with tube upgrades.
