That sounds like too many tubes to drive 6L6's, as it doesnt require 2 pentodes to tickle a 12AU7. One dual triode or a triode-pentode should do it.
I was thinking the same thing until I realized the TBS-50D used them 6AU6's in triode connection. I was home sick yesterday, and foolishly bid on an Ebay TBS-50D. Dam if I won, so now I get to think of restoration of a really old transmitter. What the heck was I thinking?
Jim
JKO