Radio age (Jan 1927-Jan 1928)

Record Details:

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RADIO AGE for October, 1927 prominent features of the new World's Record Super 10, with the exception of the filament circuit of the nine A tubes. Referring to diagrams, it will be noted that the receiver is practically master controlled, all the tubes exclusive to the two RF tubes, being fed through the Carter 1 ohm Heavy Duty rheostat. The RF tubes are operated on a separate 15 ohm rheostat ia order to furnish control of oscillation. A separate rheostat located on sub panel is provided for the first detector in order to avail greater sensitivity and finer adjustment, but as this and the I ohm are not critical once they have been set, it has been found convenient to mount them on the sub-panel where they are less apt to be disturbed once the proper setting has been attained. The detector rheostat is a Carter 30 ohm and is connected in series with the master, as the blueprint indicates. The 0-8 Volt Jewell Filament Voltmeter facilitates the setting of the master rheostat, the proper adjustment being between 4^2 and 5 on the scale. TKe foregoing description explains to some extent just why the World's Record Super 10 differs from other radio frequency-superheterodyne combination, but hardly explains the excellent range and pickup characteristic of this new superradio. A general summary of the World's Record Super 10 is helpful in obtaining an accurate idea of what the receiver can accomplish. This is best explained by first inspecting the input circuit of the set. Here he we have two stages of RF amplification, making possible the use of a short indoor antenna of from 25 to 30 feet as the pickup medium, even for the most distant stations. This eliminates the loop antenna, provides greater sensitivity, reduces harmonics and heterodyning, and because of the amplification ef the tubes and transformers, extends the range of the set, simultaneously increasing its volume. The RF pickup stages deliver to the detector of the set a greatly amplified input signal, assisting the work of the detector in producing a much better beat frequency for the IF stages to amplify. The selectivity of the set is due to the action of the RF stages in conjunction with the oscillator. Ten kilocycle separation is no longer a dream — having become a reality with the Super 10, The average radio enthusiast appreciates the sharpness of the superheterodyne as well as the popular radio frequency system and when both are combined into one working component without the loss of efficiency in either system, it can be readily appreciated that super selectivity is the result. In the World's Record Super 10, the RF and Hetrohyne systems of reception are so combined that the total output is much greater, than if one theoretically added the signal intensity of either system operated independently. Radio frequency pickup, and superheterodyne amplification when combined, actually improve each other in efficiency and in results. Granting that we have delivered an input signal of already considerable amplitude to the first detector, the Selectone IF amplifier boosts the signals to the point where second detection be 17 Fig. 1. The symmetrical arrangement of parts comprising the World's Record Super 10 gives the receiver this attractive appearance comes a serious problem. The general sharpness of tuning, retained and aided by the careful manufacture and design of the Selectone units, is maintained throughout the amplifier bp the proper setting of the potentiometer, without loss of tone due to the transformers being peaked too abruptly. The second detector with its grid bias rectification and radio frequency blocking system delivers to the audio system a wonderful signal to amplify, which the audio amplifier truly accomplishes. The net result is a thundering signal in the loudspeaker, yet beautiful in tone and depth, delicately controlled from a whisper to full volume by the manipulation of smoothly operating, non-critical controls on the panel. Even the most distant stations roar in with a mighty punch. Performance is the clinching argument in any receiver. That being the case, let us turn to the file of verified receptions and notate for you just what the set will accomplish. The laboratory where the World's Record Super 10 was developed is located on the north side of Chicago, and every radio enthusiast knows that Chicago has plenty of broadcasting stations. WBBM has its home just two blocks west of the laboratory location. It operates on 1000 watts. WEBH, a 1500 watt station is just two miles south. WIBO, with 1000 is about \y2 miles distant, WMAQ, KYW, WGES, WMBI, WGN, WSBC, WLTS, WENR, WTAS, WCFL, WAAF, all not less than 500 watts (and in most cases 1000) are located not less than 10 miles air line, and cover the entire broadcast spectrum on the average five tube radio frequency receiver. Within a range of 50 miles we have WLIB, WHT, WLS, WCBD, WJAZ, and numerous others, ranging from small fry to heavy power. What the Chicago stations miss in the ambition to smear the dial with local signals, these stations usually accomplish when everything is going full blast between 8 and 10 p. m. Yet the World's Record Super 10 tunes between them ! Using a 25 ft. antenna, on the ground floor of the building, this amazing radio receiver accomplished tuning that can only be duplicated with another World's Record Super 10. Between WENR and WTMJ (Milwaukee, Wisconsin 80 miles distant) The Super 10 brought in CJBC of Toronto, Canada. Twenty kilocycle separation — that is, WENR 10 kc above CJBC and WTMJ 10 kc below. Between WGN on 990 kc and WLS (870 kc) it was possible to tune in WGR (970) KDKA (950), WGHP (940), WRRS (930), WABC (920), and WBZ (900). On each side of WLS (870) a 20 kilocycle separation brought in WHB (890) and WOC (850) the former Kansas City, the latter Davenport, Iowa. The dials, when tuned to WSAI (830), completely exclude WOC (850). WEBH, two miles away and only 10 kc below (820) does not interfere even to the extent of background noise. WGY transmitting on 790 kc rolls in with the familiar punch and power, while WBBM, two blocks distant and 20 kc below is operating with 1000 watts. Twenty kilocycles below WBBM (770) WTAM is tuned in with ample volume, good tone, and no background interference. WTAM operates on 750 kc. Through WIBO or WHT (splitting time on 720 kc) and WMAQ or WQJ (splitting time on 670 kc) the World's Record Super 10 tuned WSUI (710), WLW (700), WJR (680), and WJZ (660). WJZ was so well received that it was possible to remove the antenna and hear the signals on the speaker with such volume that it could be heard 200 feet distant. At the upper end of the broadcast spectrum, WEAF was easily separated from WCFL. These stations operate on a 10 kc separation, and WCFL is only 10 miles away. WHO (560) can be pried off the frequency of KYW (570) with comfortable margin, KYW being about 10 miles south. World Record Circuits at 30c Send 30 cents in stamps if you want complete instructions and drawings in back issues as follows. January, 1927 Full Data on the Super 8 March, 1927 Building Ideal Model Super 8 April, 1927 One Spot Super and Power Compact MayJune, 1927 Using 9 Tubes on World's Record Super RADIO AGE 500 North Dearborn St. Chicago, 111.