Try Jack at Electra-Print.com High-Fidelity Audio Tranformers and Tube Amplifiers. I'm not sure if he does power trannies, but does everything else. He made some chokes for me, well made, well priced, and quick.
a problem with existing designs is the core B operating point - for mass market profit the competition is in how little Iron and Copper they can sell you to make VA specs
I have seen Im go up large factors in 5 % high line V test, even in a "universal" design that should be expected to work at 50 Hz as well as 60
an opportunity with custom design is to dial back core B operating point for less magnostriction, lamination vibration noise, lower primary circulating current
I have seen Im go up large factors in 5 % high line V test, even in a "universal" design that should be expected to work at 50 Hz as well as 60
an opportunity with custom design is to dial back core B operating point for less magnostriction, lamination vibration noise, lower primary circulating current
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