Show IL cited by U po podia iia tridio merth 4 I 1 avio 14 A 4 VOLT ab the hookup hook up illustrated was waa first prose presented anted by tho the new york evening world it has aroused considerable interest among radio fana fans thero there are thousands of crystal fans who want to amplify tho the cleir clear undistorted rectified by the crystal detector so n section Is devoted to a hookup hook up using one step of audio frequency amplification the step of audio amplification will not however increase the range of tho the crystal set but it will ralso raise to intelligent all of the fled fied by the crystal this set will give greater etu clency on the local stations than a single tubo tube detector but will vill not have the range of tho the tube set another hookup hook up gives the advantages of a step of radio frequency a detector and it a step of audio amplification which only requires the addition of 0 a tapped coll coil and condenser tho parts in tile above set nie anro nil all standard and can be picked apat any reliable dealers tho the antenna tuning condenser of microfarads capacity ca should be a 43 plate varIn variable ble 0 of good rugged construction while the ho condenser which tunes the secondary should be of the 1 23 3 plate variety tho the varlo coupler to give tha best results must be of ISO degree type with it n range of from to GOO CM metres the audio frequency fc quen transformer for one step as indicated in tile the sk etch lins line a low ratio it two stops stop s are added this transformer should bo be replaced by it a high ratio transformer and tho the low ratio inq on used in the last step tile tube must be of the hard type donot do not use a soft gaseous detector tubo for amplification A UY UV WD 11 or 12 UV or UV A can call bo be used in tills this circuit the plate voltage will bo be determined by tho the best operation of tho the tube it will bo be somewhere between 22 12 1 2 and 00 volts most alost tubes will do very well on about 4 45 volts olt tho the A oy or filament fila trient batt erys size elzo will wili depend upon the tube used tho the dubu will necessitate tho the use of a store stor ago age battery because of its ita high am gioi berage wello tile other tubes will work moro more or less economically on tile the dry cells tho the UV IM tubo tube can bo be oper abed from a couple of flashlight cells connected in series either alther waro or graphite rheostats can bo be used providing they have the proper values for the tubes A six ohra ohm resistance should be used for tho the ft a aft ohm resistance for the A and a rheostat of SO 30 ohms in conjunction with whit tubes this sot Is not a distance getter but Is goc good 1 tor for local stations with a pair of ear pl phones iones A two tubo tube set using ft regenerative hookup hook up and ono one step ot of audio frequency la Is fur far better for all around reception |