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I m J «s F#. ?* M I, ü C; F*.l Four-Tubs R «coi ver ta Which RF Stags Is Connected in Two Tubas; Detec tor U Rsgsnerativs; First Audio Stage Reflexes in Parallel Stage. V % -K V c. } f LÇ c - h. .s / O «A riS-2 Diagram Showing Same Circuit as That In Fig. 1, Except That the Second Audio Stage la the Reflexed One, Instead of the First. By SIDNEY E. FINKEL8TEIN, In Radio World. For the fan who has made many sets some variations on the accepted themes are very inviting, hence two eirculta are presented that offer en couragement to those who like to work out solutions from suggested data. The first circuit (Pig. 1) consista of a stage of tuned radio-frequency am plification, with Its two tubes connect ed In parallel, a regenerative detector, the first stage ofsndio reflexed In the parallel-connected tabes, the second stage of audio being "solo." The other circuit (Pig. 2). using the same principle, makes the last andlo Stage the reflexed one. The parallel connection of the tubes in the reflexed Stage is retained. Only one reason for connecting tubes (n parallel may be advanced—to make them share equally the load of the stage In which they are connected. With RP amplification so popular often there Is too much of It. so that distortion arises from RP causes, no less than from an overburden of andlo current Two Audio Stagoo Employed. As ths test Is one for reducing the overload. If any, two audio stages must be employed. Some may find that the I hook-ups as suggested will improve the menters may establish to their own satisfaction which of the two methods, If either, gives them better results In quality, and possibly even greeter vol ume than obtained heretofore, when the four tubes were hooked up simply 1 q straight faalilon. Constructors who have teat boards will find the circuits very Interesting subjects of experiment. The change Involved In making one Into the other is slight. The set, in point of distance getting, will not accomplish any more than the regulation book-up. But if a fan Is troubled with distorted reception, in stead of introducing resistances across audio transformers, or condensers that cut down the volume, be may try either or both of the methods outlined, and see If he cannot get very dear re ception without any reduction in volume. L1L2 is • radio-frequency transform er sad Cl Is a variable condenser of correct capacity to tune the secondary L2 throughout the band of broadcast ing. L8L4LS Is a 3-circuit tuning coll in which LO Is ths tickler. C2 tunes L4. C8 is a by-pass condenser, about .001 mfd . So is CS. R4 la a grid leak. abont 2 megohms The tubes are numbered 1. 2, 8 and 4. In effect tubes 1 and 2 represent only one stage In either diagram. The Input la to tiie two grids snd the out put is from the two pistes Theee two tubes should be of the same type. Two Tubes in Farm!lei. The RP load on the tube Is pertly determined by the number of turns on the primary L8. Oen«rally speaking. the lesser the Inductance end coupling, the tendency to overtoed. But aniens one has a ratio of at 4-to-l the there may be losses, L e. Insufficiency transfer of energy. Assuming, there fore^ one bee the type of winding* moot commonly used, where that ratio is need, or something user It, there may be still quite a tendency to too much BP work of the tret tube. Hence we will use two tubes in parallel of say ha the standard ta»ok-up, we must resort ■3 ; a .fr#* ra cultien and » tbe reflextag Isn't a cereftil wtrtti* Job, with proper regard for penltten snd length of leads, a» at tempts to attain Improved results an almost certain to fan. Hence be cure :«i ,a your Now. Ö» la« heavier tafle load. Maybe that la tbe »ne that should be reflected, since the are to be delivered into tbe pai»JlM-««M»W'ted stage, which U ts assumed «re «bte to handle them beet But the experimenter may find that tbe sadto toad Is not the troublesome t Ab red»« load having been •hared, astiafbetorily between tbe twu tabes (1 mä 2 ). to# àvMm O« «**» *•>*«. «Bd not for I to aa audio overload. Therefore, in such a case, the first audio stage would be properly reflexed. would be shorter that way. Fans who do not care much about the coat entailed may omit the reflex - log entirely and use either parallel connected tubes In the radio stage or In the last audio stage or in both places, as an experiment. The two seta shown La the diagrams work well, as do the two others sug gested. The problem Is for the experi menter to decide whether the parallel idea la worth while and If so, whether for radio or audio reasons, or for a combination of both. Also the leads To Use Neutroformer in Your Single-Tube Set Here la II D. hook-dp which «aas a tmlt the same as a radio frequency transformer in the nentrodyne set. The coll LI consists of ten turns of No. 28 dsc. wire on a 3-tnch tube which la dipped inside of coll L2. This latter coll consists of 58 turns of No. 28 dsc. on a 2%-Inch tube. C rep resents s 23-plate condenser attached to the L2. To tune, writes s Michigan corre spondent in Radio Digest, vary C for the wave length variations and follow VMK.<m»UEAK ii ebt't 'A* JV Using Unit Same as Radle Frequency Transformer In Neutrodyns Set. ap with the variometer for régénér era tl on. Keep the two in such rela tion that It is Just below the point where a rushing sound is beard. If properly constructed and operated the set will give excellent results go a 190 tube with an electric light circuit serial. With the same kind of an aerial and two 190 tubes as audio fre quency amplification I have beard Mexico City, stations in California and two Cuban stations I have a total list of 88 stations %seaammssaaoaa^^ RADIO RHYMES By Robert Stewart Swtliffs IN THE EVENING W HKN the saew ts on the readway and the wind a blowing hard. And tha weather uninviting as you look out to the yard: (Or perhaps down south you're living and you have no place »e go) Then'a the time you feel Uke giving your thanks for radio Whan your faaslly*s 'round about you. and tha things are cleared away. And tha dally paper's finished and x: . you haven't much to where all thing* ars mighty T«w n%m brash »way âefeettos i If Ti gat tha folks to listen aa you plug Into yaur sat. they cannot help but marvel at Om wood roue things yae etar a -singing distant blg-tawn a-ewtoglag through tbe air by radia. at abow. Or a Jasa that Perhaps some fallow's talking about tha star* above. Or yotsnjg tHt you low: Or perhaps tbe girl* are dancing to a tuna from Chicago. A thousand things entrancing era ffcr you fcy rwA%<x ■hm HMm for retiring and Will Soi«« oy rrmMmm tb« of making beta **TK» EVERY 7 Probably raw» fer the popularity of WRIOLEY'8 is duc te 1***» *» • Xt W9B MÉp Âpfwwtiâ*' €t$qpemh».H* gcsoou Fresh and fall-flavored » F» . Free Farm BaUfltaf Helps ^ Comoro t* Around ihm km buOdtag zz k assy to ■mix. ph* c®, sod ks Û "Perm ait «rtf Repaint an #Ae Form" «b» «>a hewn repair old building* qmckiy Bans Floors and Feeding Floor* will help you afld. a dofiar to your oar "Wsailbr Concrmtm Fmrm Building* plies ol bl ire prints, sod shows yon. (ttp by sssp, bow to put up Concrete Silos, Dairy Barns, Hog Houses. Milk Houses and many other forms rji Ouracrate Oooamjciwo. fl Wtafcw jo»___ Uaid*am»buiUi*t.orapmtr m éo 0m td> «fl Urnm. Sard for thorn today PORTLAND CEMENT ASSOCIATION . IP 111 Warn VhUmh CHICAGO Soest omd Erumd Urn Vtm of Comeroto fLEAR YOUR SKIN V# of (fisfiguring blotches oui ten tatioas Use Resinol Boy* Study Leather A junior technical day school for training boys for the boot and shoe trade has been opened in connection with the Cordwainert' Technical col lege In London, England. The course will be divided between general edu cation and trade subjects. Woman need no longer have the dis comfort and untidy appearance of ragged or 'Tun over* beets. They now have available a topHft (bottom cap Cf heel) that Is abeolutely gat on the bottom, stays firmly la place and wears and wears Just Ssk your repairmen on your heels, material that to put U8KIPE TopHft» U8KXDE ta the famous ■ giving each remarkable senr no* sole for year«. Made by ths United States Rubber Company. Wears twice as long as bes t leather. Important—you can put TJBKIDB Top lifts on new rimes,—Adv. ii3v Imltmd m J oop m tr dy The picturesque island of Mount Saint (Normandy) appears to be Jeop ardised as the result of a landslide. Engineer* art trying to save tbe beau tifnl old abbey which crowns tbe rock, as It Is (bered the slide any extend to tbe foundation. a Homely He—Til say she hasn't. .a SgS-* Hot water V 4 t*AN rot i mm