This morning I dug out my other two power bricks. I was going to test them with my simple test.
One was still wrapped up in bubble wrap, from when I got it. I plugged in the other one and checked the initial temperature by touching it and it was fine. After booting the Apple //c, I started my program running. After a little more than an hour it finished, with no noticeable difference in temperature.
I unwrapped the last power brick, went to plug it into the Apple //c and had some trouble with it. The cord plugs into the back of the Apple //c and without turning it around I was kind of working blind. The top of the cord is marked, strangely enough, TOP.
It didn’t seem to go in, so I looked at the cord and the outer covering was not quite straight. Apparently it had been off at some point. This cord came with an Apple //c that was crushed in shipping. I twisted the covering to straighten it out a little.
It plugged in this time and I powered up the Apple //c. This one I kept an eye on as I tested it. I checked the brick and the cord several times while running the program. This brick turned out to be noticeably warmer than the other two. I broke out the trusty Dymo LetraTag, printed out a label that said WARM, and stuck it on the brick. This one I could not sell. I could use it as a backup, if necessary.

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