6C33C? Forget it. 211/845? Useless. KT88/6550? Rubbish. Move over, drop dead, or simply die, for I am the baddest of all audio tubes. I am the 212E, (or 4212E). I am an Amperex, not the WE version. But I am totally badass. Do you
see what I mean?
A group of British audiophiles made a DIY amp using these. The results, apparently, were absolutely gobsmacking, if they were to be believed. I'd probably pay serious £ for a good amp based around these. Building some transformers that would do them justice would be a challenge... and the resulting amps rather large
Bit of a "casualty" my tube is bigger than your tube type device, however