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Single Ended Triodes (SETs), the ultimate tube lovers dream.

PP transformer in SE circuit is not a decent compromise...

... in my humble opinion, of course! Seriously, that article is ancient, from 1995, and SE was still so new in the USA that this compromise was fairly widespread. Airgapped transformers were few and far between, and the understanding of SE vs. PP was at a pretty low level as well. (That said, as I recall the rest of the circuit was not bad at all.)

I've used a ST-70 output transformer as a parafeed output, back around that time, and even without DC current it was a serious disappointment. PP transformers are designed in the expectation that the center tap will be at signal ground, so capacitances between the CT and the (close-to-ground) secondary or the core can be ignored. Capacitances from the middle of the winding on a SE transformer cannot be ignored, however. It messes up the treble, both with resonances and weird phase shifts.


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