Tom,
I've not tried the MR caps yet, but I have a pair of .47 uF ones for my Eros output caps, and another pair of 1.0 uF caps for parafeed in my s.e.x. 2.1. As for the sr-45, I was probably going to start by following John Scanlon's lead and go with something like 6.8 uF to start -- I tend to go towards the lower end on PF caps to keep the bass a bit more defined, but we'll see. First I'm just going to listen to the sr-45s as Doc sent them to me, then I can think about swapping a few components and then maybe some EMLs or other tubes.
I had used the tftf caps in another amp I had and with that particular amp I felt they were just a bit too squeaky clean and changed to the mundorf silver/gold/oil caps and they were perfect in that amp -- but that was a pentode, not a DHT, so different animal altogether.
Of course I am impatient to try the cutfs, but it will have to wait for me to get the system setup, and I don't even have the speakers yet. :-)
-- Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)