Show 3 T P Q cz 0 0 F U LZ F hookup diagram of two tubo tube Low Loss receiver which has ha selectivity volume and lack of radiation advantages by ISRAEL KLEIN selectivity volume and lack of radiation are anre the advantages offered by the two tube low loss receiver described here pans expect to reach across the country with it but with the presence of so many high powered stations on tile tho air theres no need to RO go any farther than miles or so BO its clearness that Is wanted today and that Is what this receiver affords the parts are ui 11 12 13 low loss inductance cl 01 low loss losa condenser mad capacity ca fixed grid condenser niad m fd no leak Is necessary ca fixed condenser ined it rheostat 20 clinis T low ratio transformer trans about 31 6 or 4 to 1 one pound no 18 wire two sockets one 7 by 14 inch panel one 7 by 13 inch baseboard one open circuit jack six sir binding posts one vernier dial winding the colla coils the low loss inductance colls coils are wound as follows draw a circle on a wood block 3 inches in diameter and mark 14 points round around the circle equidistant from one another drill divinch vi anch holes half way into the block and set tightly into each cacti hole a 14 inch dowel pin 3 inches long the colls coils are wound on thesia these pins the wire being abeln drawn first outside one pin then inside two outside one inside two and so on until tile tho jiember of windings called for are completed coll coil LI should have 15 turna coll LJ 12 70 turns coll 11 1 1 22 turns before taking a coll coil ot off tile the pegs drop molten settling was war over tile tie intersections ter and biml let stand until the wax hardens or tie the colls coils at tho the intersection ter with stout thread for selectivity colls coils ll LI and 12 are mounted on the baseboard parallel to each other and four inches apart the bottom of ench each coll coil Is set within two feber strips strip which are ara held together by a screw tile the screw also holds the coll coil and strips to tile the baseboard coll coil 13 Is the tickler and Is controlled by a shaft arrangement the shaft and knob should bo be set very low on the panel so that the coll coil 13 may bo be tied firmly to it so as to give it freedom of vibration with coll coil 12 it should be about an inch from LS 13 to keep the shaft from moving in and out have a hole bored through it at the inside of the panel and put a pin through it this and the dial will hold tile the shaft in place the bushing for the shaft in the panel may be the kind used for jacks and the shaft of a diameter to it lt it closely test connections doth both tubes for this sot set should be of the A type the B battery should have a voltage of 00 volts and the 0 battery 4 volts volta in trying out the set change the leads on the tickler 13 to seo bee which side gives best results also reverse leads to the 0 C battery for a similar test above nil be sure that you have the shortest pos possible sililo leads to all connections also that tile the colls coils LI IA and 12 tire four inches apart this makes for very sharp tuning chicago livening post |