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Raytheon, "The Healthy Tubes"

What makes these tubes healthy compared with the others, anyway?

Radio Retailing, April 1929

Vintage

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 a new standard of performance in this field, too.

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Vintage