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I think I'll peak inside the original HR-D470 that I bought in 1987 to see if it has this diode mod done too. I don't remember seeing it when I replaced that SuperCap before but I wasn't really looking for it.
It was built in Dec 1986.
The one that I am working on was built in Jul 1986.
The one I borrowed the PCB with the diode mode was built in Nov 1986.
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