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N-set wrote:

just a minor tech remark (feel free to ignore): the big-ass elco is theoretically still well in the picture. 10uF will have 320Ohm@500Hz, which is a fraction of 20Ohm R+3mF elco.

As I understand the AC signal flows from anode to PS and see 10uF cap and 25R resistor. It will pass the 25R resistor and go to electrolytic when the filter what the AC frequencies sees is above the 25R resistor. With 10uF cap we have 25R resistance at 630Hz so the higher frequencies (above 630Hz) flow to ground via the film 10uF capacitor and the lover cross frequencies the 25R resistor and get shorted in the big electrolytic cap. Well, of course the “the big-ass elco is theoretically still well in the picture” as it is just a first order filter and not a break wall switch and the higher frequencies are juts divided between the paths back proportionally to impedances. Still, at 630Hz we have 50% go to film and 50% to electrolytic, however the MF is filters at 3200hz that makes juts fifth of AC signal go to electrolytic cap.  BTW, I made another tweak in there and just before the electrolytic cap I put a poster for electrons saying:  “If you are HF then turn your ass back to the film capacitor”. It looks like since I pit that poster the sound become “much better”. Now, the film cap is made in Mexico, so wait until I pit the poster in Spanish….

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