Interesting that over the last month it is the third projects where people use 6C33S in preamps. A few days back I have a correspondence with Dutch guy, know to audio hoodlums as Direct Heated Rob:
...who told me that he is experimenting with low voltage use of 6C33C for his preamp. I never head those preamps it would be certainly interesting to try, even with all my disbelieve to tube preamps, particularly with two unnecessary transformers….
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche