Tag Archives: Series 2

Bose 901 Series II Active Equalizer #120325 Repaired

I recently had the opportunity to work on another Bose 901 Active Equalizer, Series II. This particular model had been in service for a long time in active use and was showing its age. It was sent back to Bose … Continue reading

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Bose Repair: 901 Series I Equalizer #31131

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 Active Equalizer Repair [Vintage Hi-Fi]

(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]

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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