...once I can secure the lid with no more tube trials...
I can appreaciate that! My speakers got spiked far sooner than my preamp's top was screwed down, and even now that was too soon. Fortunately the MC load resistor terminals reside on the outside of the MP-1's lid - there is another set of listening trials. Having tried the TX2352 (second with me to Audio Note Tantalums) guess I'll want to spring for a few of the Vishay Z201 and TX2575s that MikeE likes. At least these are production tweaks - much easier than finding quiet phono stage tubes.
Lotta interesting options for the WV lineup - which model are you using?
Tim