Monthly Archives: July 2012

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

How to Make a Vacuum Tube from Scratch

Posted on July 17, 2012 by jwk

This French radio amateur takes the classical ingenuity of radio amateurs everywhere to an incredible level, creating his own triodes similar to those used in the 1920s from scratch. Watch!

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Identifying Your Bose 901 Series 1 Equalizer [Vintage Hi-Fi] [Production Runs]

Posted on July 11, 2012 by jwk

Bose 901 Series I Active Equalizers came in two varieties, which can be used interchangeably, but have fairly different circuit designs. It’s simple to tell them apart for ordering parts for a repair with a quick inspection of the inside. Both … Continue reading →

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Wanted: Band Switch Rocker Arm Lever from Grundig 5399 or 8000-series Radio [Repair]

Posted on July 9, 2012 by jwk

I’m having trouble coming up with a replacement part necessary to bring my client’s Grundig 5399U/S back to life, so I turn to the Internet to help. Part of the band switch assembly is a rocker arm which spans the … Continue reading →

Posted in Photos, Projects, Radios and Tubes, Vintage | Tagged , , , , , , , | 4 Comments