Monthly Archives: January 2016

HH Scott HHS-20 “Scotsman” Receiver Overhaul

Posted on January 27, 2016 by jwk

A local repeat customer recently brought in his old HH Scott HHS-20 receiver for an overhaul. It worked a few years ago when he put it away, although not without a few issues of its own, and when he dug … Continue reading →

Posted in Audio, Electronics, Projects, Stereo, Vintage | 3 Comments

Idea Poll: A tutorial on buying parts online?

Posted on January 26, 2016 by jwk

Once again, I’ve been asked “Where do you buy your parts?” and that’s a question that comes up very regularly. (My answer? Mouser.com, of course.) I’ve heard from quite a few people over the years that Mouser.com can be intimidating for new … Continue reading →

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How to Read Capacitor Codes

Posted on January 24, 2016 by jwk

I ended up with a massive stash of mil-spec CDE Mica caps recently, and was searching for a refresher on decoding their military part numbers like “CM05FD221GP3”, since the caps came marked for their values but not their voltage ratings. … Continue reading →

Posted in Commentary, DIY, Electronics | Tagged , | 1 Comment

Bose® 901 Series IV Active Equalizer #501554 Overhaul and Upgrade

Posted on January 20, 2016 by jwk

From the Rain City Audio Repair Blog: This Bose® 901 Series IV Active Equalizer, serial #501554, came into the shop with the owner reporting that it loses output on one channel and the sound degrades the longer it is powered … Continue reading →

Posted in Audio, Bose, Electronics, Projects | Tagged , , , | 1 Comment

It’s good to have adapters!

Posted on January 12, 2016 by jwk

I’m working on a little amplifier from the late ’60s, maybe very very early ’70s, which uses RCA jacks for the speaker output connections. It was most commonly found on very economical and low-powered systems. (The one in question is … Continue reading →

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Bose® 901 Series II Active Equalizer #107915 Repaired

Posted on January 6, 2016 by jwk

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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Philips High Fidelity Laboratories 673 Tuner Repair and Alignment

Posted on January 4, 2016 by jwk

From the Rain City Audio Repair Blog: This Philips 673 tuner just came through the shop for an overhaul and adjustment. It was working for the most part but the alignment had shifted and there was room for improvement on … Continue reading →

Posted in Audio, Electronics, Radio, Vintage | Tagged , , , | 3 Comments

Bose® 901 Series IV Active Equalizer #219533 Overhaul

Posted on January 2, 2016 by jwk

From the Rain City Audio Repair Blog: This Bose® 901 Series IV Active Equalizer, serial #219533, came through the shop for an overhaul. The owner was reporting the left channel went out, so it’s clearly time for an overhaul! A … Continue reading →

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