This 1 in 4 out YWR RCA jack only device has no brand marking and originally came from MCM Electronics. I remember not when. I might have bought less than 10 years ago, but it wouldn't surprise me if it was made closer to 20 years ago. An equivalent match to it is no longer available new AFAICT. I depend on it daily, and as it didn't seem to be up to snuff any more, I opened it up to find its 7 largest caps to be Scatronice brand 10X17 cans 470uF with no markings to indicate date or series. 3 were oozing. 6 were marked 16v, the other 25v. ESR was high on all, but how high varied a few hundred percent. All but 2 tested in the 530-550 uF range, the others above 470 but less than 530. Not wanting to put it back together with its original leakers, I replaced all with the only thing I had that was close, Jackcons (purchased from Jameco probably over a decade ago, before knowing anything more about caps than leaking and swelling were bad, and not to replace 105C with 85C), 470uf 25v in 8X15. Each tested under 470uF, but at least 427uF, ESR .06-.07 ohms. I replaced all 14 non-major brand and unbranded smaller caps as well, 1uF X5, 22uF X2, 47uF X2 & 100uF X5. For some I had recent Panasonics, but for the rest, more old new stock from Jameco.
It works vastly better now, but I'm not sure whether good as new, or good as it could be. I might be imagining it, but it seems output from it could be a tad darker than input to it, and there's still very slight horizontal echo from white letters on black backgrounds, and from venetian blinds and other strong horizontals adjacent to solids. I'm hoping there's a non-zero chance it could be improved over the smaller Jackcons in it now, in performance and/or in potential longevity, by:
1-replacing those 8X15 cans with something close as I can get or maybe bigger than the original 10X17s maybe Nichicon PW, 10X16.
2-going to 560uF instead of 470uF, since the originals mostly tested closer to the higher than to their labeling, again, maybe Nichicon PW, 10X20.
3-replacing the newly installed small Jackcons as well, even though they all tested OK, and very close to each other.
Any comments or suggestions?
It works vastly better now, but I'm not sure whether good as new, or good as it could be. I might be imagining it, but it seems output from it could be a tad darker than input to it, and there's still very slight horizontal echo from white letters on black backgrounds, and from venetian blinds and other strong horizontals adjacent to solids. I'm hoping there's a non-zero chance it could be improved over the smaller Jackcons in it now, in performance and/or in potential longevity, by:
1-replacing those 8X15 cans with something close as I can get or maybe bigger than the original 10X17s maybe Nichicon PW, 10X16.
2-going to 560uF instead of 470uF, since the originals mostly tested closer to the higher than to their labeling, again, maybe Nichicon PW, 10X20.
3-replacing the newly installed small Jackcons as well, even though they all tested OK, and very close to each other.
Any comments or suggestions?
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