Thomas,
I am having the same fun with three rectifiers I've been playing with.
I received your 6N6P's and put them in last week. After about 50 hrs or so I decided to start some listening. The metal base 5AR4, which had been married to the Raytheon black plate 6CG7's, was now married to the 6N6P, and the sound was lean, detailed and a little too thin for my tastes. Acoustic bass lost its magic, and the midrange was a bit recessed. It could still be a result of the signal tube break-in process, but I decided to try a different rectifier regardless. I installed my Philips GZ32 and the soundstage shrunk ever so slightly (not a deal breaker), but the bass energy was over the top and then some. And the detail went a bit grainy. On certain recordings this was workable, but overall the marriage was too mid-bass heavy. Next came my original (I own 5 now thanks to my local tube guy) Tung Sol 5U4G. The soundstage was slightly wider than even the MB, and slightly deeper too, bu the midbass hump was there, and the imaging was slightly smeared (Note: we are nitpicking here...on a desert island I'm fine with ANY one of these combos). Another 48 hours had passed and i went back to the metal base. This time not so thin; better meat on the bone, and detail was very very good....but there still seemed to be a slight analytical sound (maybe a bit hot at the top) compared to the reference system.
I had posted earlier that although the 6H30DR's were an incredible pair for the 36.5 (as we've all agreed) they were too over the top, almost too dynamic, to be doubled up at the TP as well (with the metal base rectifier). But since that post I've added a pair of monoblock Spectrons, upgraded my ac outlets to Synergistic Research TeslaPlex ones, and have several hundred more hours on the metal base. Although the 6N6P's were starting to come into their own, I was tempted to put the DR's back in and hear what they sounded like. So I did. Well, last night the sound was very very much to my liking. Not over the top, but very dynamic, very balanced, lots of energy, lots of clean bass and beautiful midrange. Maybe this is what the 6N6P's will sound like once completely broken-in, but for now I'm gonna live with this combo and let it's third row center perspective grow on me. I might decide its too close, but for now I'm enjoying it.