Radio Broadcast (May 1927-Apr 1928)

RADIO BROADCAST ADVERTISER 24? New AERO Circuits For Either Battery or A. C. Operation The Improved Aero-Dyne 6, and the Aero 7 — popular new circuits are built around these marvelous coils You Should Learn About Them Now! Proper constants for A. C. operation of the improved Aero-Dyne 6 and the Aero Seven have been studied out. and these excellent circuits are now adaptable to either A. C. or battery operation. A. C. blue prints are packed in foundation units. They may also be obtained by sending 25e for each direct to the factory. AERO Universal Tuned Radio Frequency Kit Especially designed for the Improved AeroDvne 6. Kit consists of 4 twice-matched units. Adaptable to 201-A. 199. 112, and the new 240 and A. C. tubes. Tuning range below 200 to above 55o meters. This kit will make any circuit better in selectivity, tone and range. Will eliminate losses and give the greatest receiving efficiency. Code No. U 16 (for .01105 Cond.). Code No. U-163 (for .00035 Cond.) . .$15.00 . 15.00 Code No. U 12 (for Code No. U-123 (for .0005 .11003: Cond.). ..$12.00 Cond.) . . . 12.00 AERO Seven Tuned Radio Frequency Kit Especially designed for the Aero 7. Kit consists of 3 twice-matched units. Coils are wound on Bakelite skeleton forms, assuring a 95% air di-electric. Tuning range from below 200 to above 550 meters. Adaptable to 201-A, 199, 112, and the new 240 and A. C. tubes. NOTE— All AERO Universal Kits for use in tuned radio frequency circuits have packed in each coil with a fixed primary a twice matched calibration slip showing reading of each fixed primary AERO Universal Coil at 250 and 500 meters; all having an accurate and similar calibration. Be sure to keep these slips. They're valuable if you decide to add another R.F. Stage to your set. A NEW SERVICE We have arranged to furnish the home set builder with complete Foundation Units for the above named Circuits, drilled and engraved on Westinghouse Micarta. Detailed blue-prints for both battery and A. C. operation and wiring diagram for each circuit included with every foundation unit free. Write for information and prices. You should be able to get any of the above Aero Coils and parts from your dealer. If he should be out of stock order direct from the factory. AERO PRODUCTS, Inc. 1772 Wilson Ave. Dept. 109 Chicago, 111. Samson Power 'Slock No. 210 — The only block which will supply 500 rolls at 80 mils to two 210 tubes. Powerize with Samson Units for Best Results For new SAMSON Power Units insure the best there is in radio current supply by 1. Doing away with hum, motor boating and poor voltage regulation. 2. Remaining so cool after 24 hours continuous operation under full load that they will be well within the 20° rise of temperature specified by the A. I. E. E. 3. Being designed to more than meet the specifications adopted by the National Board of Fire Underwriters. 4. Insuring safety against shock because of protected input and output terminals. 5. Insuring for all tubes the correct filament voltages specified by their manufacturers. 6. Compensating for lighting circuit voltage variation by the use of a special input plug and terminal block to which is attached a six ft. flexible rubber-covered connecting cord and plug. Our Power Units bulletin descriptive of these is free for the asking. In addition, our construction bulletin on many different "B" Eliminators and Power Amplifiers will be sent upon receipt of 10c. in stamps to cover the mailing cost. Manufacturing Since 1882 Principal Office, CANTON, MASS. //TUBES/ Could Talk! "fijMPERITE TJJaich Vog of Ifour They would tell you — that only at the precise and definitely prescribed filament current, or temperature, can their tonal qualities, clarity and sensitiveness be brought out to the full. That "A" battery current constantly varies according to the age of the battery and state of charge— and operation with too little or too great current is certain death to efficient tube performance — and too quickly, of the tube itself. That only AMPERITE can automatically supply and control this exact current despite battery variation — as long as sufficient current is to be had. That you should never confuse AMPERITE with fixed filament resistors which do not do the Amperite's job. AMPERITE is sold by dealers everywhere. Price $1.10 mounted (in U. S. A.). Write for FREE "Amperite Book" of the season's best circuits and latest construction data. Address Dept. Ii.B-1 *^^idiall (Sompany 50 Franklin St., New York Jh& "SELF-ADJUSTING" 'Rheostat