Category Archives: Hi-Fi

Music Minder Automatic Power Controller for Hi-Fi Systems

Posted on August 24, 2016 by jwk

Mixed in with some other gear I’m servicing, I found this old Music Minder power box. It’s not all that obvious what it’s for at first glance! Some digging around found an explanation in the June 1958 issue of Popular … Continue reading →

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Reviewing the Gemtune APPJ PA1501A 6AD10 Stereo Tube Amplifier

Posted on August 17, 2016 by jwk

I recently picked up an interesting little tube amp via a group buy on Massdrop, the Gemtune APPJ PA1501A stereo tube amplifier. Try saying that three times fast! It’s a cute little single-ended stereo tube amp using a pair of 6AD10 … Continue reading →

Posted in Audio, Commentary, Electronics, Hi-Fi, Stereo, Toys | Tagged , , , , , , | 15 Comments

Bose® 901 Series VI #181070 Repair

Posted on August 12, 2016 by jwk

From Rain City Audio: This Bose® 901 Active Equalizer, Series VI, came into the shop recently. These are some of the most recently produced Active Equalizers, although they’re still potentially a few decades old at this point in time. This … Continue reading →

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Bose® 901 Series II #65097 Overhaul

Posted on August 8, 2016 by jwk

This Bose® 901 Series II Active Equalizer, #65097, just came through the shop for an overhaul. It worked briefly, but failed quickly on its original components. Nothing that an overhaul can’t take care of! This particular unit had its three … Continue reading →

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Phase Linear 2000 Upgrade and Overhaul

Posted on July 3, 2016 by jwk

From the Rain City Audio Repair Blog: I recently got to work on another Phase Linear 2000 pre-amp. These well regarded components are a fantastic part of any stereo system with their high output rating, multitude of inputs and outputs, … Continue reading →

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Bose® 901 Series II Active Equalizer #66380 Repair

Posted on May 2, 2016 by jwk

From Rain City Audio: This Bose® 901 Series II Active Equalizer #66380 came through for an overhaul just recently. The owner in California reported that he got these from his father, and the equalizer was sending only the right channel … Continue reading →

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Bose® 901 Series IV Active Equalizer #265335 Overhaul

Posted on April 28, 2016 by jwk

From Rain City Audio: This Bose® 901 Series IV Active Equalizer, #265335, just came through the shop for an overhaul. It’s owner bought this equalizer as a part of getting his Bose® system back up and running and sent it … Continue reading →

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1957 Grundig 5060A High Fidelity Tube Radio

Posted on April 14, 2016 by jwk

From Rain City Audio: German radios are considerably less common than U.S.-made radios from the same model years, but offer excellent performance and very beautiful styling. This Grundig 5060A from 1957 does just that, offering AM Broadcast, two Shortwave, and … Continue reading →

Posted in Audio, Electronics, Hi-Fi, Projects, Radio, Radios and Tubes, Vintage | Tagged , , , , , | 5 Comments

“Won’t that ruin the vintage sound?”

Posted on March 16, 2016 by jwk

Audio as a hobby sits in an interesting place in the world. There are hard numbers and objective measurements made with lab equipment on one end, and on the other end you have the subjective and variable linguistic descriptions assigned … Continue reading →

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Magnavox 1ST611R Tube Console Stereo Overhaul

Posted on March 8, 2016 by jwk

From Rain City Audio: A customer recently brought me the guts from his Magnavox 1ST611R mid-century stereo console for an overhaul. He’d had the console for a while, working but with some trouble, but wanted to finally get it back … Continue reading →

Posted in Electronics, Hi-Fi, Projects, Vintage | Tagged , , , , , , , | 2 Comments