COMPREI UM TELEFONE DE DISCO DE 1973 NA SHOPEE! (Será que funcionou?)

I found a real gem on Shopee for only R$40! In this video, we'll explore, test, and perform a basic cleaning on a classic rotary dial telephone: the Caiçara model, manufactured by Ericsson do Brasil for the former CTB (Companhia Telefônica Brasileira). [What you'll see in the video] Follow along step-by-step on the workbench as I investigate the true age of the device through its components (with surprises ranging from 1969 to 1973!) and test the audio capsule's functionality using a bench power supply. Since I didn't have a 30 Hz high-voltage signal generator to power the physical ringer, I made a "respectable makeshift" solution using an old Philco PSR-61 receiver and an inverted transformer to inject the necessary 70V to 80V. Will the original bells start ringing again? I also tried to create a serial intercom with another, more modern landline phone and opened the dialer mechanism to solve a chronic jamming problem using contact cleaner. If you enjoy vintage electronics, historical curiosities, and bench tests, leave a like and subscribe to the channel!