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RADIO BROADCAST ADVERTISER 245 BOOK TELLS HOW No matter whether yoj want to improve a set you now have or build a new one ~get this book first. Tells how to build the latest one, two and three dial receivers - 5 to 7 tubes. 10* PREPAID Independent Radio Corporation Manufacturers of Precision Radio Apparatus 1516 Summer Street Philadelphia Why not subscribe to Radio Broadcast? By the year only $4.00; or two years J6.OO, saving $1.40. Send direct to Doubleday, Page If Company, Garden City, New York. Only those manufac- turers whose power- units have been fully tested and approved by the Raytheon re- search laboratories are entitled to use Raytheon rectifiers or this symbol in con- nection with their products. Convert your radio set into a light socket receiver with Balkite "B" and the Balkite Trickle and High-Rate Charger Ask your radio dealer FANSTEEL PRODUCTS CO., INC North Chicago, 111. OI1 Oil glit-Socket Power4Jiiits Amateurs are often called upon to act as "purchasing directors" for neighbors whose knowledge of radio goes no deeper than their tuning dials. And now with light-socket power growing more popular every day you can well expect a request for intelligent ad- vice on what and what not to invest in. There are many good radio power-units on the market, but, since the performance of all of them depends upon the rectifying element. isn't it showing good judgment to advise a Raytheon-equipped unit? No liquids, no chemicals, no fragile filaments to handicap reliable, noiseless radio power. Your opinion is backed by a staff of engineers who make it their business to see that everyRaytheon-equipped power-unit will prove satisfactory to the final purchaser. Raytheon B is the original gase- ousRectifyingTubeandisstand- ard for most types of B-power service, guaranteed for 1000 hours of service over the period of one year. Rating: 60 m.'a. output at 150 volts. Raytheon BH is designed for heavy duty applications of light- socket power, supplying com- plete A.C. power for series- connected tubes and power amplifiers. Guaranteed for 1000 hours over one year. Rating: 85 m. a. output at 200 volts. RAYTHEON MANUFACTURING CO., Kendall Square Bldg., Cambridge, Mass. ^ THE HEART OF RELIABLE RADIO POWER ^