Tag Archives: Series 1

Bose® 901 Series I Active Equalizer #33133 Overhaul and Upgrade by Rain City Audio

Cross-posted from the Rain City Audio Repair Blog: Another Bose® 901 Series I Active Equalizer was through the shop lately, serial #33133. It came in working well enough on its original components for an overhaul and upgrade to ensure it … Continue reading

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Bose 901 Series I Active Equalizer #30924 Repaired

I recently got to work on another Bose 901 Series I Active Equalizer, Serial #30924, which needed some service. It’s coming from the original owner who purchased them new in 1970, they went into storage about 10 years ago when … Continue reading

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Bose 901 Active Equalizer #20262 Repaired!

This Bose 901 Series I Active Equalizer came to me from North Carolina, where it had been stored in original packaging for many years. Unfortunately even with careful storage the equalizer wasn’t in running condition and it looks like the … Continue reading

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Bose 901 Series I Early Production Equalizer Full Repair

I just had another Bose 901 Series I equalizer through the shop for the standard service. It didn’t have a visible serial number, but is definitely a very early production version. The Active Equalizer was revised once through the model’s … Continue reading

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Bose 901 Series I Equalizer #48830 Repaired

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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Bose 901 Series I Early Production Active Equalizer #1056 Repaired

It must be the season because another Early Production active equalizer turned up to be repaired! This is the earliest equalizer I’ve yet seen, too: Serial 1056. It’s in for the standard overhaul to replace long since failed capacitors and … Continue reading

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Bose 901 Series I Active Equalizer #50911 Repaired

I recently had this Bose 901 Series I Active Equalizer, serial number 50911, in the shop for repair. These are a lot of fun to work on and very rewarding for the great sound they produce when they’re working properly. … Continue reading

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