Monthly Archives: May 2015

Bose® 901 Series IV Active Equalizer #244305 Repaired

Cross-posted from the Rain City Audio Repair Blog: Even the later series Bose® Active Equalizers are getting older, and the Series IV is coming up more and more. I just had another one through the shop, this one sent to … Continue reading

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Marantz 2270 Stereophonic Receiver Overhaul and Adjustment

Cross-posted from the Rain City Audio Repair Blog: I recently got to work on another iconic piece of hi-fi history, the Marantz 2270 stereo receiver. I’ve had this model through my shop before, as well as a couple of other … Continue reading

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ANOTHER fine achievement in radio set design

Radio Retailing, Apr. 1929

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Bose® 901 Active Equalizer Series I #37582 Overhaul

Cross-posted from the Rain City Audio Repair Blog: Another Bose® 901 Series I Active Equalizer came through the shop just recently for a full overhaul. These Series I equalizers were made from 1968-1972 and most are beginning to experience component … Continue reading

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Need 45V batteries for your old radio?

Rayovac has been making batteries for over 100 years, and their batteries were commonly found in use with many types of battery-operated tube radios. Most commonly, radios would operate on 45V batteries with a tap half-way (for 0-22.5-45V). Two in … Continue reading

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“We’ll See You at the Trade Show!”

Radio Retailing, Apr. 1929

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Factories Making CeCo Tubes

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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Bose 901® Series II Active Equalizer #114150 Overhaul

Cross-posted from the Rain City Audio Repair Blog: This Bose® 901 Active Equalizer came through my shop recently for a full overhaul. After so many years, the electrolytic capacitors in these units leak and go open, and the resistors drift … Continue reading

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Raytheon, “The Healthy Tubes”

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

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The Audak Electro-Chromatic Pick-Up

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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