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OTL, Output Transformerless Amplifier User Group.

RE: MP Engineering OTL

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.

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