Tag Archives: hifi

Dynaco ST-70 Stereo High Fidelity Tube Amplifier

Posted on April 30, 2016 by jwk

From Rain City Audio: I recently got to work on another vintage stereo kit, the Dynaco ST-70 amplifier. These were powerful, 35W per channel stereo amps typically using a pair of 6L6GC, EL34, or similar power tubes. This turned out … Continue reading →

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

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

Bose® 901 Series II Active Equalizer #64364 Overhaul

Posted on February 27, 2016 by jwk

This Series II Bose® Active Equalizer came through the shop. It had suffered age-related failures in its electrolytic capacitors, and the resistors had drifted with age and moisture to produce the wrong curves. Fortunately, it’s nothing some maintenance can’t solve! … Continue reading →

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Merry Christmas from Retrovoltage!

Posted on December 25, 2015 by jwk

Radio & Television News, December 1954

Posted in Collections, Commentary, Vintage | Tagged , , , , , , , | 4 Comments

Merry Christmas from KF7LZE & Rain City Audio!

Posted on December 25, 2014 by jwk

Season’s Greetings!

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1956 Grundig 8080 German Hi-Fi Console Repair

Posted on October 3, 2014 by jwk

Cross-posted from Rain City Audio: German radios like this one are a lot more difficult to work on than most American and Canadian radios, and they’re a lot less common, but they do turn up once in a while. This … Continue reading →

Posted in Hi-Fi, Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , | 1 Comment

Bose 901 Series 1 Active Equalizer Repair [Vintage Hi-Fi]

Posted on July 25, 2012 by jwk

(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 →

Posted in Electronics, Projects, Speakers, Vintage | Tagged , , , , , , , , , , , , , , , , | 36 Comments