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This is an old circuit of mains-stab for TV.(1980)
Tr1: E-I 130 core, pack 50mm, air-gap 1.5mm
n1 370 turns, 1.5mm wire
n2 68 turns, 1.5mm wire
Tr2: SM 102/B (hypersil)
n1 133 turns 1.5mm wire
n2 187 turns 1.2mm wire
Unfortunately with my bad english i can't explain the function. This circuit can handle 300VA load, while the input changed from 165 to 240V, the output voltage change remain until 10%. The output waweform distorted trapezoid, because Tr2 working in saturated mode.