Radio broadcast .. (1922-30)

Record Details:

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THE Dependable B-POWER '"i. Replaces Your "B" Batteries Permanently A PER installing the All 'American "Constant-!?" you need only snap the electric switch to have permanent and constant plate power for your radio, direct from the light socket. With it there is no ruinous acid, no hum — nothing but the pure, full tone that is only possible when the "B" voltage is constantly up to standard. Write for descriptive folder showing how to use "Constant'B" with any set. Price $45 COMPLETE WITH RAYTHEON TUBE ALL-AMERICAN RADIO CORPORATION Pioneers in the Radio Industry 4213 BELMONT AVENUE, CHICAGO, U. S. A. Complete instructions for building a similar "Permanent Plate Supply Unit" may be had free upon request. Specify Bulletin B-82. *j( Tested and approved by RADIO BROADCAST