Re: Advice please on winding an audio transformer.
What is important, even using plastic bobbins with cheeks, is to use a mandrel which supports the bobbin as much as possible.
Otherwise, you find that the pressure of the wire forces the cheeks apart, and they splay further and further out. The insulation, which you cut wide enough for the initial layers, no longer works for the later layers and interlayer short-circuits become a real possibility.
At the most extreme, the cheeks are forced so far apart that the laminations can't be fully inserted, enough to butt together.
Guess how I know all that!
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