Obscure, I know. :)
I looked through my GE "Essential Characteristics" book and only found two. 6HJ8. 6AS8. Huh. I thought there'd be more of those. Doesn't seem like an unreasonable thing to want. Anything I missed?
There are a number of compactrons that seem to have it. High current filaments.
The 6JU8 is a 9 pin quad diode with 4 independent plates and two pair of tied cathodes.
The 6BF8 is a 9 pin sextuple diode with 6 independent plates and one cathode.
Obscure, I know. :)