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They don't look like 6LF6's since there is no anode cap. I found a thread on the web which says they are 12B4A tubes, and (further down) that this is a "best kept secret" tube. Someone on the thread claims to have a set of schematics for them.
Here is the link:
Didn't Julius use those in one of his earliest efforts, before he went to the 6LF6?
It is my understanding the early Futterman H1 used 12B4As.
These amps are very similar.
He might have used them also, later, as output tubes in his headphone amplifier. During one of my two visits to his shop/factory in NYC, he was building a headphone amplifier that he proudly showed off to me. It had smallish output tubes with no cap lead. I know someone who owns one, and we speculated whether his sample was the one I looked at in 1979 or thereabouts.
I have no idea. Rhino, do you know?
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