Category Archives: Vintage

Cost Engineering in the 1930s

Posted on January 15, 2011 by retrovoltage

It looks like cost engineering was already happening back in the 1930s: In the foreground, the destroyed original power transformer from the 1939 Zenith 7-S-363 radio; the rear, an equivalently rated replacement built in October 2010 by Edcor Transformer. In order … Continue reading →

Posted in Commentary, Radios and Tubes, Vintage | Tagged , , , | 3 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