Cool new icon. Indeed. :)

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What's the (snippet of) circuit diagram from?

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A "Ferrograph Series 6 Mono tape recorder", as seen here.
I found it by image-googling for "circuit diagram", and picked that one because it had valves and "old-style" resistors on it (well, it's the way I learned to draw them, 25ish years ago, and it seems that lots of diagrams just use rectangles these days).

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I used to pick up old circuit diagrams to repair the crappy old B&W TVs that a friend and I would pick up for a dollar from junk sales.

When I say 'repair', I mean replace all of the obviously screwed capacitors with modern ones. Occasionally the caps in questions were SO badly screwed that you couldn't read the capacitance so we'd hunt down the circuit diagram at the state library and read it to find out what it should be. Amusingly, the cost of the capacitor was significant compared to the cost of the TV that it was worth doing the research to make sure we got the right one.

The State Library used to store transparent copies of the circuit diagrams, back-to-back. While it was possible for a human to make it out in the original, it was almost impossible to make any sense of a photocopy. This was apparently part of an anti-copying condition that they had inherited from the manufacturers.

In short, I like old school circuit diagrams too.

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