Tag Archives: audio

Bose® 901 Series I Active Equalizer #6878 Repair

Posted on February 20, 2016 by jwk

This early-production Bose® 901 Active Equalizer came through the shop recently for a repair. These Early models were the very first production run, back in 1968, and have a pretty significantly different circuit design from the later models, and feature … Continue reading →

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Mailbag: Is The Bose 901 Equalizer Really Necessary?

Posted on October 21, 2013 by jwk

I take questions from readers often, but they don’t always make it to a Mailbag segment. I’ve got this one a few times lately, though, so I figured I’d answer this one publicly. Jim from Ohio writes, I bought a … Continue reading →

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Thrift Store Jamo MPA-101 Repaired – She’s Back Up and Running!

Posted on February 11, 2013 by jwk

I started working on a Jamo MPA-101 amplifier back in August for a friend and after some early work it sat for a while. He’s re-doing his audio system at home so I spent a few hours to finish troubleshooting … Continue reading →

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Magic Eye Tube Spectrum Analyzer

Posted on January 14, 2013 by jwk

French hobbyist Sylvain came up with a fascinating project using 8 Magic Eye tubes from old equipment to make an audio spectrum analyzer. I’ve worked with magic eye tubes quite a few times, they’re very fascinating. Originally precursors to CRTs, they’ve found … Continue reading →

Posted in Commentary, Electronics, Gadgets, Projects | Tagged , , , , , , | 1 Comment

An interesting mystery disc discovered.

Posted on October 22, 2012 by jwk

I stumbled across an interesting post over at Arcane Radio Trivia where the author discovered an old Home Recording Acetate, in bad shape, but still intact enough to recover some information. From around or before 1940, these “phonograms” were used to … Continue reading →

Posted in Commentary, Radios and Tubes, Vintage | Tagged , , , , , , , , , , | 1 Comment

Buy the Album, Guys. [EVE 6 – Speak in Code: Audio Quality]

Posted on May 9, 2012 by jwk

One of my favorite bands, EVE 6, recently got back together after a multi-year hiatus and put out a new album. “Speak in Code” came out a few weeks ago. I caught the band on their tour through Seattle just … Continue reading →

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