In Reply to: RE: MP Engineering OTL posted by Lew on June 3, 2016 at 07:58:42:
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:
http://forum.polkaudio.com/discussion/158368/an-otl-output-transformer-less-amplifier
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