Show multi audi plex circuit produces wonderful volume and distance possible with this thia popular set by LEON BISHOP procure any standard make of ISO degree varlo coupler the stator with 50 turns ot of no 20 double cotton covered magnet wire at a point eight turns from the ground side of the stator take oft off n tap which goes to the antenna across this coll connect a tor ar lable condenser this condenser must not be over in capacity but under that value if anything the grid condenser lias has a capacity of mad and the grid leak a resistance si of 8 3 lims the bypass condenser la Is mad the audio frequency amplifying transformer may be any of the he so called high ratio types tha first or detector tube rheostat should have a resistance of 30 ohms while that of the second or amplifying rheostat should be 10 ohms the detector tube D B battery voltage Is variable from 22 to 84 34 volts it la is that ali nt the outside windings of the secondary on the audio frequency transformer be con necked to the grid and that the innet side of the secondary shall be con necked to the negative side of tle tie A battery and not to the negative side of the filament this circuit when working properly will not only regenerate but will hava bave a tendency to spill over when rotor windings become parallel with the stator most of the tuning la Is done with the rotor at almost right angles to tho the stator stater tater this circuit will operate almost any type of loud speaker with wonderful volume on any local station within 80 30 miles of new york it Is even possible to io put over loud speaker reception with stations 1500 miles distant the plex circuit la Is not only extremely sensitive but wonderfully selective the best results are obtained by using tubes it must bo be remembered when using the ISO degree typo of varlo coupler that it may be necessary to reverse tile the connections to the rotor when the proper connections are obtained and the rotor Is turned parallel to the stator winding a terrific screech should be heard in the phones in other words the best point of tuning Is arrived at with the rotor nt at about right tingles angles to the stator new york herald iya r ft as aft 8 illda i acu tp t p 2 34 V il 40 70 V such a set gives volume and DI stanca |