Author Archives: retrovoltage

Visitors From Around the World

Posted on November 9, 2012 by retrovoltage

I’m working on a couple of projects – another Bose equalizer, and a Grunow radio – but they’re not quite finished to post photos, so in the mean time I’d like to post some meta commentary for a moment. WordPress … Continue reading →

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1950 RCA 9X561 Radio Repair

Posted on October 29, 2012 by retrovoltage

A friend I’ve made through the antique radio community is also a repairman himself, but ran into some scheduling difficulty with a piece of work on his bench and sent the chassis over to me for service: an RCA 9X561, … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , | 4 Comments

First Look: 1934 Grunow 750 “World Cruiser”

Posted on October 10, 2012 by retrovoltage

I’m getting ready to sell some of my radio collection to make room for new ones, but until that happens I’ve been under something of a self-imposed moratorium on new purchases. This one came up on eBay a little while … Continue reading →

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First Look: 1934 GE M-125 Radio

Posted on September 24, 2012 by retrovoltage

I was lucky enough to find a very rare, high-end radio for sale on Craigslist and jumped on it as quickly as I could. This particular one is the 1934/35 General Electric model M-125, their highest end offering for that … Continue reading →

Posted in Radios and Tubes, Vintage | Tagged , , , , , , , , , , | 13 Comments

Round-Up of RTLSDR Upconverter Choices

Posted on September 14, 2012 by retrovoltage

1/31/2026: This was originally written in 2012 and hasn’t been updated since 2016, but it’s preserved here in case any of the information is useful and to show the state of the ecosystem when RTLSDR first came on the scene. … Continue reading →

Posted in Collections, DIY, Electronics, Radio, Radios and Tubes | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , | 50 Comments

Shortwave Radio Reception with the RTL-SDR Dongle

Posted on August 6, 2012 by retrovoltage

Need your own upconverter? Click here! I bought and did a quick setup on my RTLSDR dongle using SDR# a few weeks ago, where I used it to listen to FM radio stations around my area and a few public … Continue reading →

Posted in Electronics, Hardware, Projects, Radio | Tagged , , , , , , , , | 3 Comments

New Project: Jamo MPA-101 Amplifier Repair

Posted on August 1, 2012 by retrovoltage

Project’s Conclusion Here My friend brought me this Jamp MPA-101 amplifier he picked up at a garage sale, complaining in only puts out some rumbling and humming. It looks like it’s suffered a failure in the power supply at some … Continue reading →

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First Ever Bose 901 Series 1 Active Equalizer Repair

Posted on July 25, 2012 by retrovoltage

This post is almost 15 years old! Check out this much more recent round-up of Bose 901 Series I and II Active Equalizer repair tips and tricks, and leave a comment if you have any feedback. This post was one … Continue reading →

Posted in Electronics, Projects, Speakers, Vintage | Tagged , , , , , , , , , , , , , , , , | 38 Comments

Identifying Your Bose 901 Series 1 Equalizer

Posted on July 11, 2012 by retrovoltage

Looking for the latest info on repairing your Bose 901 Series I, Series II, or Bose 800 Active Equalizer and speaker system? Take a look at the latest in-depth guide with everything you need to know (and more!) Bose 901 … Continue reading →

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Fixing a 1934 Simplex Model P Dual Band Vintage Radio

Posted on June 27, 2012 by retrovoltage

I picked up this 1934 Simplex Model P Dual Band radio for my personal collection about 7 months ago, but haven’t worked on it much until this weekend. It sat on my articulated chassis stand in the corner waiting for … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , | 18 Comments