Tag Archives: Equalizer

Bose 901 Series I Equalizer #48830 Repaired

Posted on January 8, 2014 by jwk

I recently had another Bose 901 Series I equalizer in for the standard repair service. It was from the later part of the Second Production run and so had a mixture of capacitor packages depending on the value. It looks … Continue reading →

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Mailbag: Is The Bose 901 Equalizer Really Necessary?

Posted on October 21, 2013 by jwk

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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Bose 901 Series II Equalizer #95007 Repair

Posted on October 14, 2013 by jwk

I got this Bose 901 Series II equalizer in for repair recently and have finally had a chance to send it back out! It’s going back to its home on the East Coast to be the centerpiece of a Bose … Continue reading →

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Bose 901 Series II Equalizer #96399 Repaired

Posted on September 3, 2013 by jwk

Repairs have moved! To have your own equalizer repaired, visit Rain City Audio. It’s now a self-service process! I generally write about the 901 Series I equalizers which come into my shop for repair. That’s natural – the Series I is … Continue reading →

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Bose Repair: 901 Series I Equalizer #31131

Posted on August 17, 2013 by jwk

My workbench has been absolutely swamped lately, so I’ve been rather slow on writing up the projects I finish. I’ve finally had a little bit of time to put some of this down on paper and the first thing cleared … Continue reading →

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Bose 901 Series 1 Equalizer #29827 Repaired!

Posted on February 22, 2013 by jwk

I recently got to fix up another Bose 901 Series 1 equalizer which I received for repair. These are some of my favorite electronics to work on – they’re easy to work on and each one has its own history. … Continue reading →

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Bose 901 Series 1 Equalizer #35793 Plays Again! [Repair]

Posted on February 15, 2013 by jwk

I recently had a chance to repair another Bose 901 Series 1 equalizer. This makes quite a few of these that I’ve written up on here. One of my favorite things about seeing copies of the same model is getting … Continue reading →

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Bad Capacitors Strike Again

Posted on February 5, 2013 by jwk

I’m working on another Bose 901 Series 1 equalizer. It looks to be the same manufacturing run as the first one I wrote up last July, uses the same components, and those components look like they’ve had the same failure … Continue reading →

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Bose 901 Series 1 Active Equalizer Repair [Vintage Hi-Fi]

Posted on July 25, 2012 by jwk

(Need your Active Equalizer repaired? Visit Rain City Audio) While some other projects have been pending information and parts, I’ve had a chance to work on the Bose 901 Series 1 equalizer that’s been on my bench for a couple … Continue reading →

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Identifying Your Bose 901 Series 1 Equalizer [Vintage Hi-Fi] [Production Runs]

Posted on July 11, 2012 by jwk

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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