I had one college level electronics class and I can't recall if I ever told this story, so here goes:

This is 1971 and the class is about half & half vacuum and sand. I was not strong in math and flunked Calculus in my freshman year which put me at a distinct disadvantage as math is the language of science and physics in particular. But, curiously enough, I was the only one in class who had ever refurbed or troubleshot a radio. My lab partner had no idea what a resistor or condenser looked like prior to that class and I taught him how to solder. The dude was good at math and even though he wasn't always sure

why he was using a specific formula, he could usually remember enough of it to come up with the correct answer on an exam. My methods often relied on tea leaves, chicken bones and intuition.

So... Lesson for the day is the resistance coupled amplifier and how to determine component values for a given plate voltage. Instructor draws the circuit on the board, points to one of the resistors and asks me specifically what I think the value will be. I paused for a moment, then said "Ten Thousand Ohms". Instructor gives me a distressed look and I figure I missed it by a few miles. Fifteen minutes and a fair amount of chalk dust later the answer calculates to something like 9,580 Ohms... Apparently the instructor wished I had missed it by a mile because the point of the class was to teach the value of working a formula instead of guessing a part value.

Which is why I was given the opportunity to humiliate myself 'cuz by that time I had been ID'd as

*Mister Intuitive*....

But, the instructor was cool enough to say that in practice the nearest standard part value would be 9,700 Ohms so that's what would show on the schematic. And that 10,000 is within 5% of the calculated value so it <cough!> would work Ohhhhhhhhh Kayyyyyyyyyyy.

Nothing magic, BTW, just a lucky guess on my part because 10k seemed about right for that place in that circuit..............