Radio broadcast .. (1922-30)

RADIO BROADCAST ADVERTISER Hammarlund Hi-Q 29 Authorized Official Distributors Silver-Marshall Kit Headquarters National Short Wave Aero Products WE are ready to ship all parts specified in this publication, as well as those parts called for in other leading radio papers. Tie up with a house that is amply financed to carry a complete and varied stock of merchandise. Royal-Eastern has been in business since 1897'—31 years—and we are known to have the fastest snipping facilities in New York. Send for our new 1919 trade catalog. There is a copy for you. It is chock full of all the latest radio and television developments, as well as kindred electrical lines. We feature only nationally advertised merchandise. All kits are in stock—Send your order today—Prompt shipment is assured. We know you will like our service! SEND for 100 page CATALOG "We Pay The Freight." ROYAL-EASTERN ELECTRICAL SUPPLY COMPANY 16 West 22nd St. New York City ROBERT s. KRUSE Consultant and Technical Writer 103 Meadowbrook Road, West Hartford, Conn. Telephone Hartford ArelfourTubes Jus Limping Along / MANY a good radio tube is abused by too high or too low filament temperature. Either means short life and crippled per- formance. Designed for a definite operat- ing voltage, tubes deteriorate rapidly if over or under-taxed. AMPERITE maintains constant, uniform filament temperature — automatically ad- justs its resistance to variations of "A" current supply. Its principle is unique and patented. No ordinary fixed resis- tance, designed to look like AMPERITE, can possibly do AMPERITE'S work. Improves panel layout (no hand-operated rheostats), simplifies wiring (short, direct leads), aids tuning, increases sensitivity, and rounds out tone quality. Ask for AMPERITE by name and see that you get it. A type for every tube— battery or A. C. [$1.10,with mount-" ing (in U. S. A.) at all dealers. Give them NewLite FREE— rf Amperite Blue Book" of latest circuits and construction data. Write Dept. R. B. 11 SELF-ADJUSTING''/^^/ 30 FRANKLIN ST., NEW YORK Out-Selling All Other Kits! Sargent-Rayment Screen Grid Seven Designed by the Inventors of the Infradyne Manufactured by Silver-Marshall, Inc. A Station for Every Dial Degree That is the average performance of the Sargent-Rayment Seven over the entire dial. Under average conditions 100 stations per night can be heard with it. The Sargent-Rayment Seven has an amplifier composed of four screen-grid tubes. There is no regeneration. No "grid suppressors" or other counteracting devices are used to stop oscillation, the oscillation is fundamentally eliminated in the circuit design thus allowing every bit of tube amplification to be retained for useful work. Under these conditions are we unreasonable when we claim that this receiver has more power, more sensitivity and more selectivity than any- thing else ever offered for sale? Watch the DX records go to smash this winter! WRITE FOR FREE BOOKLET Save your own time and get better results by buying this kit already built up, wired, and tested, ready to operate. Look over the prices listed below and see if it will pay you to build one, Every set fully guaranteed. Grained Aluminum Model, kit $130.00, built-up $150.00. Brown, crackle crystalline model, kit $140.00, built-up $160.00. Except for the finish, the models are identical in every respect. 5irt£/e Dial Control Verniers for Long Distance Tuning A Real "DX" Getter with 10 KG Selectivity Supplied in two fin- ishes, grained alu- minum and crackle crystalline. The crackle crystalline finish is known as our De Luxe Model and is put out only by us. Radio Constructors Corporation 357 Twelfth Street, Oakland, Calif. Please send me at once full details regarding the Sargent- Rayment Seven. I am a dealer or professional set builder and buy my supplies from the jobbers listed below. Na Address -• City and State Name of Jobber Name of Jobber If you send this by AIR MAIL we will answer same way.