Flipping through the 1960 RCA tube manual.. things
like the 6BC7 or 6BJ7
  independant triple-diodes (intended for FM disc. and color TVs .. signal
  diodes), noval base. 
I forgot about those - dumb of me, as I have about 100 or so of the things.
  I'm noticing there are some interesting tubes such
as the
  6BN8 (fully independant twin-diode-and-a-triode) that might be turned into
  2-input diode-logic gates. 
It appears that none of these designs ever had computer rated variants.
--
Will