Category Archives: Projects

Refurbishing Vintage Sansui SP2500 Speakers (Crossover Repair)

Posted on April 5, 2011 by retrovoltage

Edited to add, June 2026: This was written several years before even my first commercial repair. I certainly wouldn’t mount the caps that way nowadays, but it made sense at the time! Back then, I was more worried about damaging … Continue reading →

Posted in Electronics, Projects, Vintage | Tagged , , , , , , , | 39 Comments

Old Radio Detective Work

Posted on March 25, 2011 by retrovoltage

I’m still working on my 1941 Stromberg-Carlson 520-PG and am running into a few new problems I’ve never come across before. Back in the era of tube radios, everything was serviceable on a component level and most people had enough aptitude and … Continue reading →

Posted in Projects, Radios and Tubes | Tagged , , , | 5 Comments

Project Idea: Digital Vacuum Tube Tester

Posted on February 15, 2011 by retrovoltage

Update: I did pursue this project for a good while, and bought some parts and sockets, but ultimately decided that if I wanted to go this route I’d use a uTracer, but since I wasn’t going to be selling curve tracer … Continue reading →

Posted in Electronics, Projects, Radios and Tubes | Tagged , , , , , , , | 2 Comments

Repairing a Vintage Radio (Coronado 907)

Posted on January 13, 2011 by retrovoltage

This is my first project, a 1940 Coronado model 907. This was originally a “high end low end” receiver: it only receives the AM broadcast band, but has three tone settings and mechanical push-button presets. It also uses 7 tubes … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , | 1 Comment