soviet union had hi educational standarts in phisics (esp. is
radio engineering). In 50s lots of people could make most of the househald appliences by themselves. My father is one of them...but now he'll never come back to that "hobby" as he calls it... he gave away all the radio component. It's much easier to by the thing you want than make it yourselfe.
Some of those people became guitar builders and that's a great advantage)