Radio Broadcast (May 1928-Apr 1929)

-RADIO BROADCAST ADVERTISER. 3" Increases THE LIFE I t)\VI I. TUBI Brings Out the Hard-to-Get" Low Notes LYNCH TUBADAPTA minimizes distortion, while enabling your set to operate at full volume. By providing for the use of two lubes in parallel in the last audio socket, the output impedance of the power tube will match very closely the input impedance of the loud speaker. This means Good, Clear Reception — The Lynch Tubadapta enables you to get TONE quality that is the nearest possible approach to perfection. Dynamic speakers will give amazing results, irrespective of the type of power tubes used. The Lynch Tubadapta is made in four models to fit most popular radio sets. Can be installed in ONE minute. Price, $2.50. Write for leaflet illustrating and describing these models. You can easily decide which model will fit your set. Other LYNCH Products Metallized Resistors. Dependable, permanently accurate, noiseless. Leak-Proof Mountings. Single or double, of genuine Bakelite. Grid Suppressors, for radio frequency circuits to stop oscillation and improve reception without broadening tuning. Filament Equalizers. Used in filament circuits to keep the filaments at their best operating points. Write for 40-Page Free Booklet, "Resistance, The 'Control Valve* of Radio," ARTHUR H. LYNCH, i„c. 1775 Broadway (at 57th St.) New York Jenkins & Adair Microphone Mixing Panel TYPE 3-B \>* .'if %•>• '.yr ■ @ V ')■ v. V . ■ For Broadcasting, Electrical Recording, and Power Speaker Systems '"F'HE 3-B Mixing Panel is designed to accomA modate almost any combination of pickup circuits up to a total of six. Any three of these may be made to pass through the three Compound Mixing Controls at the same time, and instantaneous switching is available for the remaining circuits. The incoming circuits may consist of condenser transmitters, carbon microphones, telephone lines or low impedance phonograph pickup devices, in practically any combination. When a single input circuit of extremely low level is encountered, the positions not in use may be cut entirely out of the system, thus causing no loss whatever to the weak incoming signal. The panel is 5/16 black sanded Bakelite, 19 in. wide and 12j in. high. Detailed information and circuit is shown in bulletin No. 7, which we will be glad to mail to you. The net price in the U. S. A. and Canada is $275.00, F. O. B. Chicago. J. E. JENKINS & S. E. ADAIR, Engineers 1500 N, Dearborn Parkway, Chicago, U. S. A. Send for our bulletins on Broadcasting Equipment Potter Condensers X ?Q00 Condenser Block for the single I "til/vU 250 type tube amplifier T1 OQCft Condenser for the push-pull * '"fciftlU 250 type tube amplifier T OAQO Condenser Block for single * """TO 210 type tube amplifier T ?8fi 171 Condenser Block for 1 "£OU" 111 power pack with 280 type tube rectifier. OTlVf /"to Condenser Block for SilveroIVl-OYO Marshall power amplifier and power supply units.... $20.00 $22.50 $20.00 $18.00 $20.00 CD 91 0 Condenser Block for power $1C Eft sunplv unit for 210 type tube "P1 0*OV Potter Interference Eliminator Enjoy radio broadcast programs normally spoiled by interference from oil burner, ice machine motors, fans, violet rays, vacuum cleaners, etc. Remedy connect 105-05 Interference Eliminator to the line circuit at the point where interfering device is connected. Price $3.75 The Potter Go. North Chicago, Illinois A National Organisation at four 8*rcic9 .11 never k»oVr oU try You v'xl!. oan be "nUl y „,.r radio can y°ur . Vudions JERSEY CITY • april, 1929 . . . page 360 «