Tag Archives: hi-fi

Bose 901 Series II Active Equalizer #120325 Repaired

Posted on March 13, 2014 by jwk

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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Ohm Acoustics Model D Speaker Refurbishment

Posted on February 21, 2014 by jwk

Classic speakers are always a delight to work on, and speakers have capacitors and other parts which require service, too. Over the years those components can fail and result in poor sound and even potential speaker damage. In this case, … Continue reading →

Posted in Audio, Hi-Fi, Projects, Speakers, Stereo, Vintage | Tagged , , , , , , , , , , , , , , | 1 Comment

1962 Zenith MK2670 Classic Tube Hi-Fi Console Stereo Repaired

Posted on February 15, 2014 by jwk

A version of this article appears in the October 2014 issue of Nuts and Volts magazine. I recently got to work on something a little bit different – a tube hi-fi stereo console! This particular one, a 1962 Zenith MK2670, was a very high-end … Continue reading →

Posted in Audio, Projects, Radios and Tubes, Stereo, Vintage | Tagged , , , , , , , , , , , , | 26 Comments

1977 Yamaha CR-2020 Vintage Stereo Receiver Repair

Posted on January 26, 2014 by jwk

If you’re looking for a repair for this particular model of receiver, sorry – Rain City Audio no longer takes Yamaha CR series for repairs due to them requiring such an extreme amount of work. This post is a good … Continue reading →

Posted in Audio, Electronics, Hi-Fi, Music, Stereo, Vintage | Tagged , , , , , , , , , , , , , , | 34 Comments

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 →

Posted in Audio, Bose, Electronics, Speakers, Vintage | Tagged , , , , , , , , , , , , , | 4 Comments

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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Klipschorn Meets Altec

Posted on February 8, 2013 by jwk

I love old hi-fi stereo equipment, especially the larger stuff which really had a lot of personality. While doing some research on Klipschorns, I discovered a striking reinterpretation of the classic Klipsch design: An Altec Lansing multicell horn in place … Continue reading →

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Bose 901 Series 1 Equalizer Repair (Deux)

Posted on November 16, 2012 by jwk

A client recently engaged me to repair his Bose 901 Series 1 equalizer. This second one was in a bit worse shape electrically than the previous one I’ve written about, with one channel entirely dead and scratchy switches. I received … Continue reading →

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New Project: Jamo MPA-101 Amplifier Repair

Posted on August 1, 2012 by jwk

Project’s Conclusion Here My friend brought me this Jamp MPA-101 amplifier he picked up at a garage sale, complaining in only puts out some rumbling and humming. It looks like it’s suffered a failure in the power supply at some … Continue reading →

Posted in DIY, Electronics, Projects | Tagged , , , , , , , | 2 Comments