Category Archives: Uncategorized

Bose® 901 Series II Active Equalizer #107915 Repaired

From the Rain City Audio Repair Blog: This Bose® 901 Series II Active Equalizer, serial #107915, came through the shop for a repair. The owner reported it was developing the typical age-related problems, so it was time for an overhaul! … Continue reading

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Service Shortcuts December 1932

Due to a technical problem, this post was initially published with no content on Tuesday, December 29th. Retrovoltage regrets this error. Hints for the service shop, from December 1932’s Radio Retailing: A.V.C. Accessory for Screen-Grid Sets by Joseph E. Soos A … Continue reading

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Sherwood S3000-V Stereo FM Tuner Repair

From the Rain City Audio Repair Blog: This Sherwood FM Stereo tuner came into the shop recently. It’s owner successfully completed a re-cap of the unit, but the specialized tools for performing an accurate FM Stereo alignment are beyond the … Continue reading

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Eric Engineering Model 357 High-Fidelity FM Tuner

I recently got to work on something quite unusaul, the Eric Engineering model 357 hi-fidelity tuner. Built by obscure outfit Eric Engineering in Santa Monica, CA in 1961, there’s relatively little known about these units. It’s a fairly simple ratio-detector … Continue reading

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Remember to Vote!

With elections coming up, don’t forget to vote! If you’re here in Washington like I am, you should have your ballot already and can return it by mail. Use this handy tool from WordPress to find out more information about … Continue reading

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Vintage Engineering is Beautiful

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Mailbag: Is The Bose 901 Equalizer Really Necessary?

I take questions from readers often, but they don’t always make it to a Mailbag segment. I’ve got this one a few times lately, though, so I figured I’d answer this one publicly. Jim from Ohio writes, I bought a … Continue reading

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