Sounds like they are odd ball horz output tubes by the
specs stated. Prob only used in a few chassii for a short time.
In the good old days we used to order 2 of almost anything so
odd ball parts stack up including tubes. Explains why so many
around. The price would sure beat 4 quality 6CA7's etc if
you can make it right ! I bet most old horz outs have been tried
as finals or P-P amps no matter how odd they are.
73 Zeno
