Author Archives: retrovoltage

The Speaker Spotter — June 19, 2026

Posted on June 19, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. Vintage Bozak B302A Speakers – Excellent $500 · … Continue reading →

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Everything to Know about Bose 901 Series I and Series II Active Equalizer Repair & Speaker Systems (and the 800, too!)

Posted on June 12, 2026 by retrovoltage

A deep dive into the history and repair of Bose 901 Series I and II, plus the Bose 800, sourced from direct experience repairing more than 500 Active Equalizers. Includes vintage ad copy, photos, tips and tricks, schematics, and parts lists. Continue reading →

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The Speaker Spotter — June 10, 2026

Posted on June 10, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. This one was delayed while I was traveling, … Continue reading →

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Upcoming Projects for 2026

Posted on June 2, 2026 by retrovoltage

Having had a chance to unpack some of my shop from storage and settle in to the new space, I’ve got an idea of what projects I’ll be working on myself in between projects with my shop partner. Bose Active … Continue reading →

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The Speaker Spotter — May 29, 2026

Posted on May 29, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. This week’s report is KEF heavy, with a … Continue reading →

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DBX SFC-10 Soundfield Imaging Controller Repair

Posted on May 23, 2026 by retrovoltage

I’ve had this DBX SFC-10 Soundfield Imaging Controller in my stash for a while, and figured I’d ease into repair work again with a relatively easy project. I’ve always been interested in speakers which use an active equalizer – the … Continue reading →

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The Speaker Spotter — May 22, 2026

Posted on May 22, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. Pair of Vintage Bose StudioCraft Tower Speakers $200 … Continue reading →

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The Speaker Spotter — May 15, 2026

Posted on May 15, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. JBL L65 “Jubal” — $1,800 (Kennewick, WA) JBL’s … Continue reading →

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Returning from Hiatus – 2026

Posted on May 14, 2026 by retrovoltage

It’s been a few years since I stepped away from electronics repair, but I’m excited to announce that Retrovoltage is once again back in action and working on projects. I don’t expect to take direct customer work any time soon … Continue reading →

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HH Scott HHS-20 “Scotsman” Receiver Overhaul

Posted on January 27, 2017 by retrovoltage

A local repeat customer recently brought in his old HH Scott HHS-20 receiver for an overhaul. It worked a few years ago when he put it away, although not without a few issues of its own, and when he dug … Continue reading →

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