| Show U 10 10 4 am 14 Y 0 douglas W maor of radio i N 7 1 ej 4 aa ij cov 88 4 diagram for portable thre three tube multi audi plex circuit cling usino UV tub operated fron from dry batteries by LEON BISHOP hero here Is I 1 a ft f r it 1 rant it I 1 three tub tube multi giudi pin pies circuit UV hubn operated entirely from dry batteries batte ripe procure i a ISO IRO degree aviv avi varlo coupler wind the tutor stator 4 with 44 40 turn turns of no za double cotton w cot rl irod wire starting froin from tin tile round ground aide of the stator tap every four turns for five taps tape utilizing 20 turns of wire connected to the SW which to t la in turn connected to the tile serial circuit cin alt tho the rotor circuit II 11 rolly hae any where from fifteen to forty five turn turns of wire depending depend lne upon the amount of regeneration dey developed eloped in the circuit IT AT regeneration li Is too trane the num ber of 0 turn turns may be reduced until violent li Is subdued this li Is not a single circuit but Is 1 really a two tuner of very aim 1 pie adjustment from this circuit ll 11 almost impossible across the stator 8 Is I 1 connected a mt mf variable Tiri able coa condenser deaser drably the 23 plate type care should be exercised xer clied that the rotary plates plate are connected to the gmund amund as a this will eft minate body capacity effect effects the grid condenser con denier cl la Is of the mica type mf the grid leak OL 04 should be anywhere from two to ale the hither higher the better the rheostats R and 14 are 30 ohms one rheostat controlling the detector tube while the other rheostat control controls the two amplifier tubes the A battery consists co nelst of three cells cell of dry battery oftentimes a I three cell 0 battery now common on 0 the market may be used where corn com pact nee la not essential three block blocks of B battery will be for loud speaker reception on this ctr clr cult it would not be advisable adT leable to set get the exceptionally small lie size 1 bat tery but preferably the middle slie size ae as there li Is ome some length of life to thie this battery the bypass condenser con dener 02 la is mf and must be connected as its shown the audio studio frequency transformers AF and AP AF should be of the higher ratio lype type care should be exercised that the outer winding of the secondary ary unless marked 0 on the trans to make handy torch for soldering joints the roell alcohol torch would not may lit in a high wind and the blow torch wai was out of order no ito the follow ing was improvised in order to older solder the ati antenna tenna joints on an a recent installation firs a i email small baking powder can with a cover vu was pared and a 4 hole was we punched in lik the cover next a is piece of cotton wate waste wa was rolled rot ed into in 0 ware wl a ball bill and a piece of stiff wire wae a twisted twitted around it in the form of a handle the handle was through the hole in to the can top and the burr on the punching premised preened down so 10 that it gripped p the handle bandit C ral t quick and easy method ef of soldering thoc those outside joint affer after preparing pre parini the joint to be sol dered la the usual kranner fam anner the ball of waste te Is waked in caoline I 1 and set et on fire am with a biatch the blazing waste Is held under the joint until the flux aux flow flows and then the joint la is touched with a piece of wire older solder A further application of heat beat cause causes the older solder to flow in the joint when finished with ith the torch put ithe the ball tall of blazing naste into the can and the cover into pig place wilt will eatIng ulAb the jnell cadlo adio kewa pir khoum IP 1 rinn tel I 1 grid arld of tile till tute e hip vir ther il sl the tile th oulI ile connect lilt nela tive hide side of ohp A ix ill and not the tile lit alle of tie tit bleim inter there is t liff renco legathe nc ullie rubt anent and negi tilse A batter you are ar timing it rheostat on a portable set et two tn jacki Nuil lelent ilie first or sitione ju ja located across tit ohp prini prin nry tary ol 01 second AV AF by ily met method hod of it Is 1 listen in on the cliones while the tile ppul er Is 1 in operation ope rallon without tiling the loud output second jack Is exclusively for tor I tyne Is fc fe first detector tube and 17 37 volf volts tc f two amplifier tubes tube the operation of the get set lii is I 1 simple lin pip there being practically two real tuning adjustments are the variable condenser cv an rotor IL the witch SW Is I 1 used for selectivity only the denser dial reading may be reci and nd aill be found to be conal con from time to time in recording same sam e stations in a panel layout the variable denser should be at the left am ani varlo coupler at the right the i a contacts should be above the dit the center of the panel it li is eeten tested that just below the dials tie push pull a switch itch be introduced Introduce i the A battery circuit to tun tube tubes on and off the two raol rhe can RO go st at the richt right of the panel the two jacke jacks directly under i the grid rid leak GL and con condense densel should be located as near the det tube as possible the lead be over one inch long thie this circuit Is of all multi andl plex fa vanhly rolly only it I 1 signed for dry battery tubes for able use during the summer m it can quite readily be een seen th parts suggested la in this circuit cot got into a email small pace space if it the d tive panel layout Is followed circuit will give excellent loud a sp reception as well as real DX DY i la Is characteristic to fo the multi andl aud class new ew york sun contact cleaner for use on your sod by JOHN A DENGLER if it your receiving set ie is to woi wol maximum efficiency it li Is necessary that the tube socket tact be clean clem A dirty or con clort contact will often I 1 poll what v cm ny del if fafty socket contact cleaner cut I 1 place of round wood otherwise be excellent recep reception tina ai As rule these contacts are cleaned nith ith piece of sandpaper or emery imery cloth held in place on the theand rid of a stick this method however holcie ter la Is clumsy and a III food good job la in rarely done if the lit tie instrument herewith described la Is used for thie this purpose it will be a sini aim pie mutter matter to do this vork work and clean contact contacts will always be assured this contact cleaner can be used on both standard atan dard and UV or C soc aock keta eta it la Is made of a piece of round wood 1 inches in diameter and ai inches long one end of thia this piece of quod for it jenith of one inch la Is cut down 0 three quarters of an inch in diameter the other end la Is also slightly rat cut down for a length of about one halt inch two round piece of emery cloth of a diameter one half inch latter larger than the tad ends of the contact cleaner aae are now forced over the end by means of two copper coppe r rind rings one quarter of an ian inch wide it might be adlisa le to cut allta lit about one 14 ter of an loch deep edea edges of th the emery cloth alaks ao to bat that when forced in place a smooth surface ill be obtained bained to uee use thia this instrument if la Is only necessary nece wary to remove the he tube insert one end of the contact cleaner in the socket and while applying prest SUM gure twist twitt it from aid aide to aide alde it wui will be found that the contact contacts raa en be cleaned in this manner very esaley 11 the ticie time and labor expends d on ion tul contact cleaner cl estner will be amply simply repaid by the knowledge that the efti efficiency clency of the receiver will not be bk lowered by imperfect tube contact Radio nam nm |
