Page about the classic transfomer boards
Documentation coming - in the meantime ask me if you have questions
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This board is a classic Neumann-like single fet with a transformer circuit. It fits in two different Chinese donor bodies. The cylindrical one above and the tapered one below. The tapered one is a tricky fit though, more on this in due course.
This is basically a KM84 circuit.
C2 and C3 are probably oversized.
Transformer is a Vigortronix VTX-101-003 6.45:1 ratio. Or the OEP equivalent which is identical.