Monthly Archives: April 2011

Repairing Antique Radio Electrics from Start to Finish (3) – Grunow 589

Posted on April 26, 2011 by retrovoltage

Update: The series is complete. For more articles and information, visit these other posts. This dates back to 2011, when I was pretty new to this hobby – I’d probably do a few things differently now! Part 1: Identification and … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , , | 15 Comments

Repairing Antique Radio Electrics from Start to Finish (2) – Grunow 589

Posted on April 22, 2011 by retrovoltage

Update: The series is complete. For more articles and information, visit these other posts. This dates back to 2011, when I was pretty new to this hobby – I’d probably do a few things differently now! Part 1: Identification and … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , , , , | 14 Comments

Repairing Antique Radio Electrics from Start to Finish (1) – Grunow 589

Posted on April 20, 2011 by retrovoltage

Update: The series is complete. For more articles and information, visit these other posts. This dates back to 2011, when I was pretty new to this hobby – I’d probably do a few things differently now! Part 1: Identification and … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , | 17 Comments

Stromberg-Carlson 520-PG: After Action Report

Posted on April 18, 2011 by retrovoltage

My Stromberg-Carlson 520-PG (previous parts 1 2) is finally finished! The radio came out ahead of my expectations, even, and was delivered to its new home yesterday where I expect it will continue to serve for years to come. See … Continue reading →

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

Stromberg-Carlson 520-PG Nearing Completion

Posted on April 13, 2011 by retrovoltage

My current main project, refurbishing my Stromberg-Carlson 520-PG radio (which has been a fair amount of fun so far) is nearing completion. I’ve just completed an IF alignment, which greatly improved the sound quality and volume and general performance. Radios … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , | Leave a comment

EICO 221 VTVM Dial Scale

Posted on April 7, 2011 by retrovoltage

In a fit of clumsiness, I sent my EICO 221 VTVM flying off my bench and it struck the ground pretty hard. Not bad for its first major accident since 1959. Everything survived…except the sensitive meter movement, which snapped a … Continue reading →

Posted in Commentary, Vintage | Tagged , , , , | 1 Comment

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 , , , , , , , | 38 Comments

Showcase: Homemade 1930s-Style AM Radio Transmitter

Posted on April 5, 2011 by retrovoltage

Radio hobbyist Jon the Grimm built this beautiful “homebrew” AM transmitter using tube technology, in the style of an original 1930s radio transmitter. Operating under Part 15 regulations, his transmitter has achieved a short range – perfect for feeding modern … Continue reading →

Posted in Collections, Commentary, Radios and Tubes | Tagged , , , , , , | 6 Comments