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Since it's fun to irresponsibly speculate (lol), I think it's more likely that we're just spoiled by the precision of the test equipment we have available. It's nothing to read a couple hundred volts with .1V resolutin on a DMM, but takes some effort to read the same thing to within 10% on a typical analog meter (I'm thinking a "modern" 260 on the 500V scale.)
Most old consumer stuff used 10-20% tolerance parts, so I try not to get too hung up on the numbers. Back when I was in electronics school, one of my instructors (a grouchy old fart) was fond of saying "close enough for government work." Now that I'm becoming a grouchy old fart, I appreciate the simple brilliance of that statement.
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