A Universal Tester , for vintage radios , Magnetic Coil Tone Arms , Turntable Cartridges , Microphones , Horn Speakers , Speakers , Setting up Coffin Valve Radios ,Head phones and a Guitar Amp even . It is a tester, mainly in the Vintage radios era. By the way the speaker holes where drilled out using a " sink Strainer " from the kitchen sink
excellent video,,,thanks for explaining your electronic project. i found your video very interesting and educational, i enjoyed it very much..will be looking at your other videos,, take care , from Letseeitplease
letseeitplease 1 year ago 2