Category Archives: Vintage

Raytheon, “The Healthy Tubes”

Posted on May 17, 2015 by retrovoltage

What makes these tubes healthy compared with the others, anyway? Radio Retailing, April 1929

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The Audak Electro-Chromatic Pick-Up

Posted on May 16, 2015 by retrovoltage

Throughout the music world AUDAK Reproducers have long been the standard by which others are judged and valued. Their ability to respond to every shade and colortone…so essential to REAL music…has been faithfully transmitted to the AUDAK Chromatic Pick-up, creating … Continue reading →

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The New Stewart-Warner Series 900 Radio

Posted on May 15, 2015 by retrovoltage

This Consolette Ensemble combining Stewart-Warner Table Cabinet Receiver with the New Stewart-Warner Dyphonic Reproducer, an arresting value at $113 (less tubes). Radio Retailing, April 1929

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Accuphase C-200 Professional Pre-Amp Full Overhaul

Posted on April 16, 2015 by retrovoltage

When Kenwood’s engineers left to form Kensonic, they really brought their A-game, and this Accuphase C-200 pre-amp is no exception. It’s a mammoth device, built with exceptional attention to detail and top of the line components throughout. The owner reported … Continue reading →

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Harmony H400 Tube Guitar Amplifier Repair

Posted on April 13, 2015 by retrovoltage

I recently had another Harmony amplifier, the  H400, through the shop for an overhaul. It’s owner, who previously sent me a Harmony H500 for service as well, took it to a local tech but wasn’t satisfied with the repair so … Continue reading →

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Telefunken Bajazzo Sport 201 Transistor Radio

Posted on March 30, 2015 by retrovoltage

I don’t typically service portable transistor radios, but I make an occasional exception for something especially unique or interesting. The Telefunken Bajazzo Sport 201 is no exception – it’s a high end piece of German engineering, a great performer with … Continue reading →

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Sony TA-5650 Full Re-Cap and Adjustment

Posted on March 4, 2015 by retrovoltage

I recently got to work on another of the Sony VFET line of integrated amplifiers, the Sony TA-5650. I’ve had one through the shop previously, and this one came in for the same service. It came in running fine – … Continue reading →

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1960 Grundig SO191 Stereo Hi-Fi Console Repair

Posted on February 27, 2015 by retrovoltage

Updated July 2026 with some additional photos from the archive, and schematics at the bottom. This was a pretty early repair from back in the shop days so there’s a few things I’d do more cleanly for a customer today, … Continue reading →

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Bose® 901 Series VI Active Equalizer #199732 Repaired

Posted on February 20, 2015 by retrovoltage

A first for my shop, I recently worked on a Bose® 901 Series VI Active Equalizer! These are considerably newer than the Series I-IV that typically come through the shop, although they’re still getting to be 25+ years old at … Continue reading →

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Philco 39-45 Retrofit to 40-201 Cabinet Vintage Radio Repair

Posted on January 16, 2015 by retrovoltage

A neighbor approached me with his family’s Philco 40-201 vintage radio to be restored back to working condition. It had sat for several decades, very well preserved, but ultimately needed some service after the years. Very unfortunately, however, the original … Continue reading →

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