Category Archives: Projects

Refurbishing Vintage Sansui SP2500 Speakers (Crossover Repair)

Posted on April 5, 2011 by retrovoltage

A look at refurbishing the crossovers in a pair of Sansui SP2500 speakers to improve their muddy sound weak highs from early in Retrovoltage’s history with audio repair. Includes links to buy the required parts from Parts Express. 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