Monthly Archives: February 2013

Bose 901 Series 1 Equalizer #29827 Repaired!

I recently got to fix up another Bose 901 Series 1 equalizer which I received for repair. These are some of my favorite electronics to work on – they’re easy to work on and each one has its own history. … Continue reading

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KN0CK HF Upconverter Fits Inside the USB Tuner’s Enclosure

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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Bose 901 Series 1 Equalizer #35793 Plays Again! [Repair]

I recently had a chance to repair another Bose 901 Series 1 equalizer. This makes quite a few of these that I’ve written up on here. One of my favorite things about seeing copies of the same model is getting … Continue reading

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

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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Klipschorn Meets Altec

I love old hi-fi stereo equipment, especially the larger stuff which really had a lot of personality. While doing some research on Klipschorns, I discovered a striking reinterpretation of the classic Klipsch design: An Altec Lansing multicell horn in place … Continue reading

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Bad Capacitors Strike Again

I’m working on another Bose 901 Series 1 equalizer. It looks to be the same manufacturing run as the first one I wrote up last July, uses the same components, and those components look like they’ve had the same failure … Continue reading

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DIY SDR HF Up-Converter by WA7JHZ: Another good choice for your RTLSDR.

Reader David Forsman, WA7JHZ, read the round-up of RTLSDR upconverter choices and sent me a photo and build schematic of one he designed which was featured in the January 2013 issue of QST, the ARRL‘s monthly magazine. This circuit up-converts … Continue reading

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