Radio Broadcast (Nov 1926-Apr 1927)

RADIO BROADCAST ADVERTISER 315 Centralab Non*lnductive , Variable High Resistances Centralab Radiohms with two terminals, and Modulators or Potentiometers with three terminals, provide gradual Noiseless control of oscillation or volume in any circuit. Specified for the Infradyne S-C, Samson T-C, Henry Lyford, Universal and many other circuits. Used as s't a n d a r d equipment on a large number of commercial receivers, and by both the U. S. Navy and Signal Corps. There is a resistance and correct taper for every circuit. At your dealer, $2.00. Write for circuit hook-ups. CENTRAL RADIO LABORATORIES Milwaukee, Wis. Makers of variable resistances for 60 makers of leading standard sets. ~w Centralab A1 udio rem , Amplification The four types thoroughly explained in a fully illustrated booklet 9 x 12". This booklet will be sent to you absolutely FREE if you will send me six cents in stamps to cover cost of handling and postage. W. McMANN 64 Church St. Dept. R.B. New York City 75AWJEEK BUILDING RADIO S£TS# In Your Spare Iw^aJSM \ Time ™)flQ| Join the Radio Association of America. ■ Learn how to build and repair sets. The 1 Association will train you — start you out in ' business, if you wish. Be the radio "doctor" of your community. $3 an hour upwards easily made. EARNS $500 IN SPARE HOURS "I have at last found myself," writes Lyle Follick, Lansing, Mich. "I have already made over $500." Werner Eichler, Rochester, N. Y., writes, "... have made over $50 a week in my spare time." Our members are starting radio stores, increasing their salaries, securing better positions, passing radio operator examinations, earning big money in spare time. JOIN ASSOCIATION NOW! Are you interested in radio for pleasure or profit? Join now because we have a Special Plan whereby your membership need not cost you a cent. Only limited number of these memberships acceptable. Write now for details — before it is too late. MAIL THIS COUPON ^^tadio Association of America, 1 Dept. RB-1,4513 IUvcnsTvood Ave, Chicago. I Send me details of your Special Radio Association Member| ship Plan. | Name | Address | City State AmerJran Radio Products Sold Only by Authorized AmerTran Dealers of* a Id X < 4 1 a < s < 3 The AmerTran Power Transformer Type PF-52 Type PF-52 is intended for use in the better type of power supply developments. It will convert the standard no volt, 60 cycle alternating house lighting current to a higher voltage for the plate and lower voltage for filament supply. Price £18.00 Each The AmerChoke Type 854 This is a scientifically designed impedance or choke coil of general utility, designed primarily for use in filter circuits. As an output impedance for by-passing d<rect current from the loud speaker it is both efficient and economical. Price £6.00 Each AmerTran Types AF-7 and AF-6 AmerTran Audio Transformers, types , AF-7 and AF-6, have been considered for years among the leaders in audio amplification. These popular and efficient models are made in two types — AF-7 (ratio 32:1) — AF-6 (ratio 5:1). Price £5.00 Each The AmerTran De Luxe Audio Transformer. Made in 2 Types. #10.00 Each Those Who Know in cRadio Those who take their radio seriously such as experienced engineers and experimenters use AmerTran De Luxe Audio Transformers. And the reasons are true tone quality and realistic reproduction which result from ideal amplification. These men know by test and comparison that the AmerTran De Luxe makes a transformer coupled amplifier excelling all other forms of amplifiers. They know, too, how well the Amer^ Tran De Luxe performs in Power Supply Developments. Used with other AmerTran Products, it will make a power unit capable of dependable, satisfactory service. Every AmerTran De Luxe is manufactured to maintain a high laboratory standard. Its improved performance recommends it especially to those seeking "better than the average" radio reception. Write for free boohjet, "Improving the Audio Amplifier." It contains valuable technical data. American Transformer Company 178 Emmet St. Newark, N. J. "Transformer Builders for over Twenty-Six Years" 5 I tn > X > n > X w f I > X 1 > X m I AS*** 1 x1 (0^ art . ArtEttJ\AN ^ehTivv.v| ■jf Examined and approved by Radio Broadcast -J(