I think this amp might kick my butt lol. The main issue is, besides the distortion, it has no low end. Measuring the turns ratio in the OT, it's 50% which suspiciously is what it would be if it was a push pull OT. I'm trying to think about what else could do this but the coupling caps and resistors all seem reasonable and shouldn't be blocking the low frequencies. I'm starting to think these OT are just garbage...
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I am afraid I must have missed a video, or do not understand what I thought I did, but how did the problem of increasing the cathode current by reducing the cathode resistor not end up overheating the PT? Great series and great channel in general. Thanks for all your efforts.