Monthly Archives: March 2016

Bose® 901 Series II Active Equalizer #46234 Repair

This Bose® 901 Series II Active Equalizer, serial number 46234, came in for a repair just recently. As is happening with nearly all of these early ’70s equalizers by now, this one had developed poor sound quality and distortion and … Continue reading

Posted in Audio, Bose, Electronics, Projects, Stereo | Tagged , , , | 3 Comments

1946 Setchell-Carlson 416 “Frog Eyes” Radio Repair

This little post-WW2 AM Broadcast receiver made a trip from the central Skagit Valley down to Seattle’s Rain City Audio for service. The owner had one of these decades ago and recently picked up another, and wanted it to be … Continue reading

Posted in Audio, Electronics, Projects, Radio, Radios and Tubes, Vintage | Tagged , , , , | 3 Comments

“Won’t that ruin the vintage sound?”

Audio as a hobby sits in an interesting place in the world. There are hard numbers and objective measurements made with lab equipment on one end, and on the other end you have the subjective and variable linguistic descriptions assigned … Continue reading

Posted in Audio, Commentary, Electronics, Hi-Fi, Vintage | Tagged , , , , , , , | 3 Comments

Friday Link Roundup: March 11th, 2016

What’s good this week? Let’s see: Mohammed Samji takes us through a hifi power conditioner supplying electricity to some very expensive B&W speakers. Interesting! [Part Time Audiophile] Break something plastic? There’s a plastic welding kit for that. Looks like it … Continue reading

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Magnavox 1ST611R Tube Console Stereo Overhaul

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

The Awkward Engineer AWK-105 Analog Meter Clock

A few years back, I did a roundup of the various meter clock projects which were floating around the Internet those days. Some were really intricate: I’m a bit late to the party, as this came out a few years … Continue reading

Posted in Collections, Gadgets, Home, Ideas | Tagged , , | 2 Comments

Neat Little 60FX5 Stereo Single-Ended Tube Amplifier

While digging around, I came across a really simple circuit in the RCA Receiving Tube Manual describing a 1WPC stereo amplifier using only two tubes, the 60FX5 power pentodes, and a single silicon diode. The 60FX5s have high enough gain … Continue reading

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Bose® 901 Series II Active Equalizer #96405 Overhaul and Upgrade

This Bose® 901 Series II Active Equalizer, #96405, just came through the shop for the standard overhaul and a bit of an upgrade. It was suffering from the usual age-related issues, and had been worked on a bit in the … Continue reading

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Friday Link Roundup

What’s good this week? Let’s see: Internet Radio in a Classic Cathedral Case – rather than destroying an old radio, nick.r.brewer built an entirely new case in the same style to house an Internet-streaming radio platform for the Pi Hack-a-Day … Continue reading

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The Speaker Spotter – March 3rd, 2016

Some interesting stuff on Craigslist in this week’s The Speaker Spotter, a curated selection of Seattle’s local speakers for sale online. As always, Retrovoltage is not affiliated with any of these sellers and you should click through the link to the … Continue reading

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