Category Archives: Vintage

1934 Silvertone 1708A Repair and Restoration

Posted on April 23, 2013 by retrovoltage

I recently had the pleasure of working on a 1934 Silvertone 1708A which was brought to me for repair locally. This was great – having a radio repaired can be a big decision, so I’m happy to show off my … Continue reading →

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Klipschorn Meets Altec

Posted on February 8, 2013 by retrovoltage

I love old hi-fi stereo equipment, especially the larger stuff which really had a lot of personality. While doing some research on Klipschorns, I discovered a striking reinterpretation of the classic Klipsch design: An Altec Lansing multicell horn in place … Continue reading →

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Depression-Era Radio: 1934 Grunow 460 Tombstone

Posted on January 24, 2013 by retrovoltage

I’ve had this Grunow 460 sitting in my queue pending for a little while and it’s finally on it’s way home looking great! There was a fun extra bit of detective work to identify and solve the issues that came … Continue reading →

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First Look: 1934 Grunow 750 World Cruiser

Posted on November 19, 2012 by retrovoltage

I picked up this Grunow 750 “World Cruiser” radio from eBay a little while ago for an incredible deal and now it’s time for it’s turn on the bench. These radios are fairly uncommon and frequently sell for several hundred … 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 →

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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 →

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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

Bose 901 Series I Active Equalizers came in two varieties, which can be used interchangeably, but have fairly different circuit designs. It’s simple to tell them apart for ordering parts for a repair with a quick inspection of the inside. Both … 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 →

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