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Original Message
RE: MP Engineering OTL
Posted by Lew on June 3, 2016 at 07:58:42:
Without a schematic, diagnosis would be very difficult, but I bet this is a Futterman-type OTL. What are those output tubes? Are they 6LF6s or related? They are really close together, too close. One clue would be the presence of an output coupling capacitance; are they cap-coupled?
They look home-made or else you've taken off a cover to make the photo.