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Published on Jun 7, 2011
My dad built this oscilloscope in the early 1980s. When he gave it to me I went into Radio Shack to get a replacement vacuum tube for it and the clerk told me, "I'm sorry sir, but we don't sell vacuum cleaner accessories." True story. I remember when you could go into any drug store and use the vacuum tube tester as I did on many trips with my dad as a boy.
Here I have attached a phone jack from my android phone to the V-input on the oscilloscope and I am playing music from my Pandora app. :) Hooray! Still working after 30 years!