heathkit ag-9a oscillator mods circuit bending synthesizer demo video
Channel: thenormanconquest
Date: 2015-07-12

this is a vintage heathkit (DIY 1960s electronics company) that i modified to have a rough square wave output, as well as 1/4" and 1/8" outputs.  i also changed the lamp color to be a very strong blue LED, and added a blue LED for the main output.