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  #21  
Old 01-09-2023, 10:15 PM
redk9258 redk9258 is offline
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Join Date: May 2017
Location: Troy, IL
Posts: 159
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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