Author Archives: jwk

“We’ll See You at the Trade Show!”

Posted on May 20, 2015 by jwk

Radio Retailing, Apr. 1929

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Factories Making CeCo Tubes

Posted on May 19, 2015 by jwk

CeCo Plant No. 2, now partially in operation and to be finally completed in April – located at Providence, R.I. Radio Retailing, Apr. 1929

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Raytheon, “The Healthy Tubes”

Posted on May 17, 2015 by jwk

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 jwk

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 jwk

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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Yamaha B-2X Check-Up and Adjustment

Posted on May 13, 2015 by jwk

I recently had this Yamaha B-2X through the shop. It’s a massive beast of a power amplifier from the late ’80s, delivering up  to 170W per channel with 0.002% THD. Being somewhat more recent, this one just needed a quick … Continue reading →

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Extracting Screenshots from the HP 3585A Spectrum Analyzer

Posted on April 22, 2015 by jwk

I’ve posted a few times about my HP 3585A spectrum analyzers over the past several months, and after chipping away at the problem I’ve finally solved the screenshots issue! It boiled down to a bad GPIB cable for my National … Continue reading →

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Accuphase C-200 Professional Pre-Amp Full Overhaul

Posted on April 16, 2015 by jwk

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 jwk

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 jwk

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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