The interesting thing about the EL3N is the impedance of the load/transformer stays the same in triode and pentode.
This makes it easy to work with. It definatly has more gain in pentode it sounds a little diferent I think triode sounds
better in the output stage. Have to give it more listening to but I think the EL3N has enough gain in pentode to make
a one tube per chanel amp.
Less is more the less parts the better it sounds.
From what I have read the EL3N triode has curves similar to the 45 and 50 tube (i.e. in good company) and the pentode, well not so much but decent. Hopefully there will be suitable gain and the minimal parts will more than offset the slightly lesser curves. The real acid test... let Lucy audition with her Adele CD! Will be very interested in the results!
BTW, for your output transformers in this type of config. do you run around 7K primary and multiple secondary taps (i.e. 600 ohm, 32 ohm etc.) to support different headphone impedances?