From Adam Rewired

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Just thought I would send in a few pictures of that Heathkit O-Scope I have... It still works but can't really be used for anything but trying to see what "shape" a given input is... Picked it up at a yard sale for $20 about 15 years ago... Come in handy once or twice! Oh ya, I havent opened it but from what I can see inside, and from the amount of heat that it gives off, it contains vacuum tubes


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