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RE: MP Engineering OTL

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:


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Follow Ups Full Thread
Follow Ups
  • RE: MP Engineering OTL - airheadair 17:06:52 06/03/16 (4)
    • 12B4A - Lew 19:42:10 06/03/16 (3)


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