Radio broadcast .. (1922-30)

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RADIO BROADCAST ADVERTISER 657 Radiotron WD-12. The standard base dry cell tube. ^N "tf ^ jret a good detector Radiotrons WD-11 and WD-12 are the same tube but with different bases. Radiotron WD-12 has a standard navytype base. With it, you can change your set to dry battery operation. Askyour dealer today. This symbol of quality is your protection What will Radiotron WD-1 1 and WD-12 do as detectors? First — they are sensitive to weak signals — superlatively sensitive, as remarkable distance performances show in thousands of one-tube sets. Second, they are good "oscillators" — and that is important in regenerative circuits. And third, they are quiet in operation — add no electrical noises to the music, or speech. Radiotrons WD-11 and WD-12 are famous as audio and radio frequency amplifiers — too — and have made possible the hundreds of thousands of dry battery receivers that are in use today. They mean clear, true reception — over big distances— with dry batteries! Be sure to get a genuine Radiotron. Radio Corporation of America Sales Offices: Suite No. 32 233 Broadway, New York 10 So. La Salle St., Chicago, III. 28 Geary St., San Francisco, Cal. R-EG. -U. S. PAT. OFF. Tested and approved by RADIO BROADCAST