Thanks, Paul, just an idea and I really didn't know the Rdc specs for the various chokes except the c7x, which every bottlehead probably knows is 270 ohms ;-).
Another opt question: is there a way to configure the opt for an 8 ohm load with a primary closer to 5k, instead of 4 or 8? I knew there are some intermediate taps in there somewhere but no idea what they are. I'm seriously thinking of putting this opt in the sr-45 as the nickel with the 45 tube seems to be just a bit too sweet.
-- 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)