3 ms·
They're probably thermionic tubes, a.k.a. valves. You want them accessible so you can replace them, but they're also fragile so you put cases over them so you d
by david-given 11y ago
They're probably thermionic tubes, a.k.a. valves. You want them accessible so you can replace them, but they're also fragile so you put cases over them so you don't bump them.