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.RADIO BROADCAST ADVERTISER. TRIAD Injured RADIO JTUBES •jsn for Hietukf in the black andiietltn Irienqular box" Unlimited POWER without Distortion. TRIAD INSURED RADIO TUBES are manufactured in a plant equipped with the most modern machinery known. The technical skill and special proc- esses which produce TRIAD Tubes allow unlimited power that retains all the truth and beauty of the original tone. When a tube combines such a feature with a printed certifi- cate guaranteeing a minimum of six months' perfect service, it must be good — tube pur- chasers realize it. That's why dealers are enjoying greater profits with TRIADS than they have ever experienced before. Tune in on the TRIADORS every Friday evening, 8 to 8:30 (Eastern Standard Time) over WJZ and asso- ciated NBC Stations. TRIAD MFG. CO., Inc. Pawtucket, R. I. TRIAD x I N S£/ K E^r EADIOTUCES Bring AmerTran DeLuxe Audio Transformer — List Price $10.00. Type 151— Between one input and two output tubes—List Price $15.00 the Studio Type AF-8 Audio Trans- former — Either 1st or 2nd stage audio — Turn ratio 3V4 — List Price $6.00 Type 710 Audio Trans- former — Between two input and two output tubes—List Price $20.00 AmerTran Power Transformer — TypePF-245A— List Price $22.00 to your Home There is no excuse for imperfect radio reception. But even today, receiving sets fail to reproduce music and the speaking voice in true tone identical with the range of pitch and the rich fulness of sound quality as broadcast in the studio. The weak point in most receiving sets is in the audio system. AmerTran Audio Transformers and Power Transformers shown here perfect the audio system and bring the programs into your home exactly as they go over the air through the mi- crophone. For further descriptions of these and thirty-odd products in the field of radio repro- duction that have attained the perfection neces- sary to AmerTran Standard of Excellence, write for Bulletin 1065. The facilities of our engineering department are at the service of everyone interested in bet- ter radio reproduction. QUALITY RADIO PRODUCTS AMERICAN TRANSFORMER COMPANY Transformer builders/or over 29 years 178 EMMET STREET, NEWARK, N. J. AMERICAN TRANSFORMER CO. 1 78 Emmet St., Newark, N. J. RB-12-9 Please send me Bulletin 1065 containing complete informa- tion on AmerTran Transformers, for better radio reception. • DECEMBER 1929 • 1 19