As my few comments on the "High Wycombe" Big Bottle GZ37 were in another thread, I should probably specify why I like it.
Of the rectifiers I've tried in the Modwright Sig. Truth Sony 9100 and LS 36.5 (including the Mullard GZ32 (brown and black base), GZ34 (std. black base), GZ37 (std. brown base and High Wycombe); RCA 5U4GB, and 5V4), the High Wycombe stands out for it's smoothness, bloom, musicality and enveloping soundstage.
It is more extended at the extremes than the regular GZ37, more relaxed and musical than the GZ34 (I have not heard the metal base version however), and "bigger" and yet more resolving than both.
In contrast the Mullard GZ 32 is tighter and more focused with better imaging than any of the other tubes. I've found one each of the black (definitely better than the brown) base GZ32 and High Wycombe GZ37 (with the former in the linestage and latter in the source) to be the best combination of virtues.