Radio Broadcast (May 1927-Apr 1928)

Record Details:

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RADIO BROADCAST ADVERTISER 171 New Aero Kits Used In Important Circuits The Improved Aero-Dyne 6, the Aero 7 and Aero 4 — all popular new circuits — are built around these marvelous coils. You Should Learn About Them Now! AERO Universal Tuned Radio Frequency Kit Especially designed for the Improved AeroDyne 6. Kit consists of 4 twice-matched units. Adaptable to 201-A, 199, 112, and the new 210 and A. C. tubes. Tuning range below 200 to above 550 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 .0005 Cond.) .. .$15.00 Code No. U-163 (for .00035 Cond.)... 15.00 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. Code No. U 12 (for .0005 Cond.) . . .$12.00 Code No. U-123 (for .0()035 Cond.)... 12.00 AERO Four Kit An exceptionally efficient kit for use in the Aero 4 and other similar circuits. Consists of one Aero Universal Radio Frequency Transformer and one Aero Universal 3Circuit Tuner. Uses 201-A, 112, 199 and new A. C. tubes. Code No. U. 95 (for .0005 Cond.) $8.00 Code No. U-953 (for .00035 Cond.) 8.00 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 and for the Chicago Daily News 4-Tube Receiver and the Aero Transmitter set, drilled and engraved on Westinghouse Micarta. Detailed blueprints 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. Double Impedance Tuned oAudio oA mplification — gives uniform loudspeaker output over entire audio range from 40 to 10,000 cycles. — quadruples the undistorted power output of amplifier tubes. Attaches to any radio set or phonograph without tools and without changing the set. Th Type No. A275 Completely wired Ready to operate *27™ HARKNE Double Impedance Tuned Audio Amplifier (Licensed under Hiler Audio Patents 1589692 and 1615224) THE Harkness audio amplifier is a new and outstanding development in the search for better reproduction of musical sounds. This amplifier, with a good loudspeaker, reproduces voice and music with a degree of perfection which is almost uncanny in its realism. Never before has it been possible to re-create musical sounds with such marvelous fidelity. Two new patented improvements have made this possible. Tuned to Emphasize Low Tones The amplifier is tuned to emphasize the amplification of low tones below 200 cycles. This compensates the inability of loudspeakers to reproduce low tones at their natural intensity. The amplifier supplies additional energy to the loudspeaker at low frequencies and the fidelity of reproduction is thereby greatly improved. Low tones are reproduced at their natural volume. Actual measurements show that the Loudspeaker output at low frequencies is the same as at high frequencies. The output is uniform from 40 to 10,000 cycles. Undistorted Power Output Increased By a patented method of inter-stage coupling, the undistorted power output of the amplifier tubes is greatly increased. The Harkness amplifier can handle four times as much volume as any other type of amplifier without overloading, tube blocking or distortion of any kind. Easily Attached to Any Set The Harkness amplifier will greatly improve the volume and tone fidelity of your set. You can attach it in a few minutes, without tools and without making any changes whatsoever in your set. It can be used with any radio receiver, from a crystal set to a super-heterodyne. Your Satisfaction Guaranteed Mail your order to the address below and the Harkness amplifier will be sent you by return. Send no money in advance. Just write a letter or post-card ordering amplifier type No. A275. On delivery pay the postman $27.50 plus a few cents postage. Attach the unit to your set and hear the improvement. If you are not entirely satisfied, return the amplifier and your money will be instantly refunded. Mail your order today. Tuned Double Impedance Parts If you wish to install this system of amplification in a new or old receiver, using your own tube sockets, etc., you can purchase the essential parts as separate units and mount them on the base-board or sub-base of your set. The essential parts are listed below: — 3 — HARKNESS Double Impedance Tuned Audio Couplers ( 1st, 2nd and 3rd stage types) #16.50 1— HARKNESS Audio Output Filter Unit 4.50 Dealers and Set-Builders — Write for Discounts and Catalog KENNETH HARKNESS, Inc. NEW YORK, N. Y. Suite 42 181 SULLIVAN STREET