RCA 816k Console Radio, circa l938  c.l999 catskillki  
o6L6's.. mainstay of fine audio tube output.

My Fender DeVille uses a pair in the same configuration, and they are capable of driving you from the room at only half volumn.   RCA and Leo Fender knew what they were doing, in fact, 6L6's are one of the few tubes that are still made today, by two Russian companies, and a Chinese firm.  The inside poop is try to get new old stock GE 6l6's made prior to l980.  Some old milspec pulls are available and worth considering when retubing.
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