Category Archives: Electronics

1936 Zenith 5-S-29 Repair with Dial Face Replacement

Posted on December 12, 2013 by jwk

I recently had the privilege of working on this beautiful 1936 Zenith 5-S-29 tabletop radio. It’s a beautiful 5-tube table radio with a 6-inch speaker and the iconic black Zenith dial and lightning bolt Z pointer. This one is special, … Continue reading →

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Bose 901 Series I Active Equalizer #50911 Repaired

Posted on December 3, 2013 by jwk

I recently had this Bose 901 Series I Active Equalizer, serial number 50911, in the shop for repair. These are a lot of fun to work on and very rewarding for the great sound they produce when they’re working properly. … Continue reading →

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1936 GE Model A-52 Antique Radio Repaired!

Posted on November 22, 2013 by jwk

A change of pace from the Bose equalizers and hi-fi I’ve been working on a lot of lately, I had the pleasure of working on a 1936 GE Model A-52 antique radio. This is a nicely designed and straightforward table … Continue reading →

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1954 Philips 778-2 Canadian Antique Radio Repair

Posted on October 24, 2013 by jwk

I was lucky enough to get to work on a beautiful 1954 Philips 778-2 radio console. It had been moved around and played for a while but eventually ended up giving only buzzing instead of audio output. I’m surprised it … Continue reading →

Posted in Electronics, Projects, Radios and Tubes, Vintage | Tagged , , , , , , , , , , , , , , | 15 Comments

Evidence of Past Repairs

Posted on September 16, 2013 by jwk

It’s always interesting to see what’s happened with equipment that’s been worked on previously. It’s often a mixed bag with some great repair jobs, some that have a lot of room for improvement, and some that really just don’t measure … Continue reading →

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KN0CK HF Converter Rev. 4 is Released!

Posted on July 25, 2013 by jwk

The complete Rev 3 KN0CK HF Converter has sold out and been discontinued. That’s okay, though, because it’s been replaced with the KN0CK RTLSDR for HF Revision 4! This model incorporates a lot of the feedback from the community about the … Continue reading →

Posted in DIY, Electronics, Gadgets, Radio, Technology | Tagged , , , , , , , , , , , , , | 1 Comment

Overloaded 1931 Transformer [Fried Electronics]

Posted on June 7, 2013 by jwk

I’m working on a 1930/31 Westinghouse WR-8 Columnaire clock-radio which had a bad transformer. The filter capacitors failed and shorted the high-voltage secondary, burning it open and causing a lot of heat and melting.   The replacement is a General … Continue reading →

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Coming Soon: KN0CK Rev B Integrated HF RTLSDR

Posted on May 1, 2013 by jwk

Marty KN0CK developed a very interesting v1.0 HF converter based on surface mount technology that fits inside the casing of an RTLSDR tuner dongle. He’s recently sent me schematics for the revision, which should offer even better performance! This new iteration … Continue reading →

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KN0CK HF Upconverter Fits Inside the USB Tuner’s Enclosure

Posted on February 19, 2013 by jwk

Marty KN0CK sent me some details to publish about his great looking miniature HF upconverter board for the RTLSDR, the HF Alchemy DVB-T Active HF Upconverter. It’s an incredibly miniature SMT board with an SA612 mixer and SMT oscillator, and … Continue reading →

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Thrift Store Jamo MPA-101 Repair

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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