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I'm working through a full restoration of a Performa 550 w/ Apple IIe card and it has this microphone board (820-0388) with two leaky capacitors. I'm not sure if these are 33u or 4.7u capacitors (tempted to believe they're 4.7u and the 33 is the series or something like that). I can try to...

Cruising Marketplace is sometimes a bad (financial) idea. Incidentally, it's how I discovered how many Mac Classics I can fit side-by-side in a Fiesta ST hatchback. In the past three weeks, I've disassembled everything, cleaned plastics, glass, and metal thoroughly, neutralized capacitor...

Disclaimer: I can read schematics but I’m not skilled in theory of operation. Therefore I spend way too much time toning out traces and not enough time reading data sheets and knowing how chips do what they do. I learn how things operate as I go. It’s decently entertaining, but not necessarily...