Of course adding caps of different values here and there also improves stuff a lot. But just this alone was very interesting
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Sorry, I only saw the initial screenshot in the thread, not the subsequent tweets. That said: The jailbars seem to be about 1 cycle per tile. That's far lower than any signal that'd be getting thrown around the Famicom's internal buses. Tuned properly, it could work.
I was thinking more along the lines of something that could be connected in-line with the Famicom's video output in order to mute the jailbar effect. Given the NTSC color burst frequency, notching out a frequency of 1 cycle per tile shouldn't affect the eventual output.
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From what I can tell, the SRAM seems to be parasitically pulling a couple milliamps off of the the bus, which leads to cycles of voltage dropping (increased luma) across the raster, one per nametable square at the beginning - corresponding with nametable CIRAM fetch by the PPU.
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Perhaps the most noninvasive strategy involving the output signal would be to introduce a comb filter instead of a notch filter, tuned in such a way to repeat the low-frequency luma component in the pre-bar zone in the raster but not the high-frequency chroma subcarrier.
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