2A3 is my favorite... just wish it had more than 3.5 watts of power... the 50 is up next, but only 5 watts... the 45 is not my cup of tea... blah!
The 300B (Western Electric, Living Voice, Takatsuki) is a great tube, with a beautiful tonal balance... A lot of the Chinese & Russian junk can give the 300B a bad rap... they really aren't 300B's and don't meet the original Western Electric spec's... just sayin...
My $0.02,
Pete