Show an AW S it xa AM C in 0 m IV y 9 AA electrical diagram of a resistance C controlled ont rolled set 0 by PERCY WARREN in radio world the most that coo can be accomplished on three tubes ili n volume and DX Is by tile the use of the three circuit tuner followed by two transformer stages of audio there are many variations of the fundamental design of the detector part and there are respective advantages in each the set shown herewith herell ah has the following fo lowing main features 1 A variable resistor controls regeneration 2 A variable resistor controls volume on the audio side smooth regeneration control Is obtained by using a fixed tickler with the variable resistor in parallel or as ad in this case in series with the plate coll coil the tickler placed in inductive relation to the grid of the tube produces feedback feed back which makes the tube oscillate when the resistance Is not high enough to prevent that one terminal of the variable resistor should go to the plato plate and the other to the coll coil now as we vary the resistance of this we can increase or decrease the effective inductive value of the tickler wiring the set on the tuner used in the detector r circuit there are arc six posts each one of which Is numbered post 1 goes to the lie antenna clip on the terminal strip post 2 goes to the ground clip post a 3 goes to one terminal of the grid condenser and to the grid leak 11 the other terminal of this combination goes to tile lie 0 post of socket 1 post 3 also goes to the station stationary aTy plates of the only variable condenser cl post 4 goes to the rotary plates of this same condenser and to tile the F post of socket 1 post 0 6 Is internally connected to one terminal of the stationary tickler winding one terminal of the resistance IM goes to the P post of socket 1 tills this has 0 marked on the post post 5 goes to the top terminal of a double circuit jack it such a jack Is to be used otherwise connect this terminal to the P post pose of the AFT 1 the B this AFT goes to the bl post det del on strip p if the jack is s to be used connect the B post to the inner terminal and the bottom to the B 13 dot det clip the G post on AFT I 1 goes to the G post on the socket 2 the P F post on AFT 1 goes to the A clip the P post of AFT I 1 goes to the P post of socket 2 the B post goes to the B D post of AFT 2 and to the bottom terminal of the sin gle circuit jack the G post goes to the arm ol of the cla and to the 0 post of socket 8 the resistance wire post of this cla goes to the F post on the AFT 2 the B posts of both go to the B amp clip now you can use two individual ballast resistors ra and as per diagram which ore aro placed in the negative leg of the amplifier tube filaments all the F posts go to the A clip connect the A to the B list of parts one 3 circuit tuner includes colls coils and ra one mad variable condenser ca CD one 2 meg leak B R one mcd grid geld condenser two low ratio audio frequency transformers afta afta one single circuit jack ja one double circuit jack ja jl two am derites aa or 99 ra one cla RC one 4 inch dial two knobs one 20 ohm rheostat ira |