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Let me know your thoughts on this:

In many old, transformerless, series filament (AA5) radio/amps, one side of the AC is indeed tied to the chassis, along with the ground for B+ ...

In such a case, is it possible then that the B+ on the heaters would be carried through the heaters?

This assumes that the cathode really is tied to one side of the heaters, which I havent fully verified, but seems likely.

micahcmiracle 1w ago

Oof. I'm in circles. ⭕️ ... 🤣

The tube in question (35W4) is not directly heated. The cathode and heater is not connected.

In fact it can hold its isolation up to 360v: https://www.amplifiedparts.com/sites/default/files/associated_files/35w4.pdf

So there's that. Such misinformation spread through AI. 🤷‍♂️

This is all moot now. Thank you for your attention to this matter.

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Discussion

ChipTuner 5d ago

XD Yeah thanks again for clearing that up. I use AI for software, every time I've tried for electronics I get spun in circles and always end up back in my college textbooks and notebooks lol.