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RE: Since parafeed is the "new kid in town"

Push-pull OPTs will work in parafeed, but usually not that well. I have done this myself, and heard a few that others have made. The main issue in my limited experience is high frequency resonances due to the distribution of capacitances. P-P transformers are designed in the expectation that the center tap will be at AC ground, whereas SET transformers assume the B+ input is at AC ground. Kind of like putting car tires on motorcycles.

Gapped transformers have much less inductance than the same windings with interleaved core laminations, but the interleaved-core inductance does vary with level and frequency. The lower inductance may limit the bass extension, but you can do a more precise calculation with a known constant inductance, and still see some of the parafeed advantages over series feed. Used in parallel feed, an airgapped transformer can handle 5-10 times as much power before running into saturation problems (low frequencies at high levels).

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