What a circuit diagram doesn't tell us

Alan Edward Klein said:

Reminds when I was a kid and we had vacuum tube TV's. When the thing went bad, you'd pull all the tubes and test them down at the nearby pharmacy that had a tube tester in the store along with replacement tubes to purchase.

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My Dad, an electrical engineer who repaired TVs while in college, would interrogate the circuit diagram pasted to the inside of the TV's back cover so only the bad tube got tested. He was occasionally wrong. That, for me, was a good thing because I liked going with him and watching the tube tester in action. Good memories!

vandergus said:

There's a similar component in Pentax cameras with automatic aperture control. I think it is observing and controlling how far the aperture stops down. Here's a more detailed explanation.

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This is impressive work, but while I like the size, appearance, features and weight of the MZ-3 and other MZ/ZX-series cameras, they aren't the easiest things to keep alive, IMO. Some plastics and implementations thereof are more enduring than others.

4season said:

This is impressive work, but while I like the size, appearance, features and weight of the MZ-3 and other MZ/ZX-series cameras, they aren't the easiest things to keep alive, IMO. Some plastics and implementations thereof are more enduring than others.

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Agree. Hence the upgrade to brass parts