Author Archives: retrovoltage

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

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 →

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

Repairing the Farnsworth K-262P Vintage Radio

Posted on June 24, 2012 by retrovoltage

I recently worked on a Farnsworth K-262P from between 1948 and 1951. His wife bought the radio to listen to records, and it came to me with reports that it had been working for a time but had inexplicably gone … Continue reading →

Posted in Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , , , , , | 10 Comments

Dell Inspiron 1545 with Broken LCD Screen – Dumpster Laptop Repair

Posted on June 22, 2012 by retrovoltage

My apartment has what I like to affectionately call the “free pile”, where neighbors leave things they were throwing out but might have too much value to throw in the compactor outright. I’ve left a few things there myself, and … Continue reading →

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1938 Philco 38-C-12 “Coronation” Radio Repair

Posted on June 19, 2012 by retrovoltage

I’ve had this radio on my bench for a little while, and she’s finally back up and running – and it plays great! It’s a 1938 Philco 38-C-12, special edition to commemorate the crowning of King George IV and Queen … Continue reading →

Posted in Photos, Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , , , , , , , | 7 Comments

How Television Benefits Your Children [Vintage Ad]

Posted on May 17, 2012 by retrovoltage

Motorola, leader in television, shows how TV can mean better behavior at home and better marks in school! Own a Motorola and you know you own the best. Does that clown look terrifying to anyone else?

Posted in Commentary, Photos, Television, Vintage | Tagged , , , , , , | 5 Comments

Highway Advisory Radio Interference in Seattle from Saskatchewan (CBK)

Posted on May 14, 2012 by retrovoltage

Flammable cargo was prohibited under the Washington State Convention Center on I-5 last weekend according to the large Smarter Highways signs along SR-520 in Washington, as there’s some sort of maintenance happening. There’s a highway advisory radio station on 530 AM … Continue reading →

Posted in Commentary, Radios and Tubes, Technology | Tagged , , , , , , , , , , , , , , , , | 1 Comment

Build Log and Review: Mable Audio VT-86PP Kit Hi-Fi Amp Project

Posted on March 30, 2012 by retrovoltage

About a year ago, someone left a comment that really looked like spam on one of my pages advertising a web store selling tube audio gear and parts for guitar and audio amplifiers. Against everything I’ve ever learned about behaving … Continue reading →

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