Radio Digest (July 1924-Apr 1925)

17 April 4, 1925 RADIO DIGEST-Illustrated Four Filter Eight Tube Super-Heterodyne Part V-Wiring With Push Pull Amplification By Jacques Fournier THE assembly having been completed from Parts III and IV, we are now ready to begin the wiring. Figure 15 is presented to show all wiring which appears above the sub base, while figure 16 shows the wiring below the sub base. If these two drawings are used in conjunction with the schematic diagram shown as figure 2 in Part I, no difficulty should be encountered. It will be found a good plan to put in the, filament wiring first and it is suggested that the positive filament bus be the first wire. In figure 16 this wire runs from hole 3 to hole 25, with short wires branching from it at holes 5, 8, 10, 12 and 16, with a wire leading up to hole 21. This bus is to be connected to the filament switch and the other side of the filament switch connects to the second binding post from the right looking at the set from the bottom, as' shown in figure 16. At the same time a short lead can be put in connecting the positive filament binding post to the minus B binding post. Negative Filament Leads The negative filament leads can now oe put in by connecting a wire from the right hand binding post to the rheostat and another wire from the rheostat down to hole 26, across to 15, then to 11 9 7 ™£.,2' Witl? a branch connecting to hole 20. These wires should be insulated with spaghetti tubing to avoid short circuits with high voltage leads which will be put in later. The next two wires are the longest in the receiver; one of them runs from hole 1 to hole 23, while the other one connects the two-circuit jack at the left end of the base with hole 24. The oscillator coil is mounted with the pickup coil at the bottom, and the second of the two long ^f%lUSt „mentioned P^ses up through hole 24 and connects to the end of tlie Pickup coil toward the bottom of that coil. «,, °1 Sr, °„ng wire which Passes up through hole 23 connects to the upper end ot the pickup coil. Filter Box Connections Considering the upper side of the receiver it will be found convenient to connect the first grid leak and grid condenser to the O terminal of the first detector tube, +90 +45 -B +A -A Figure 16 S^%5. ^jstki* --SLsirjja ?., the first Quality Parts A/afcWforPerfectTeamwork IrfLr "h?°u~?P" "e.eds first *»'''* P^sperfectly matched-to give you real radio rrrd7™leKaiSta;dard Radi° Part is ^signed, made, matched and guaranteed by Federal That « why you find Federal parts in all the better £S-ups-that is why you should i„.i.tetton i-ederal parts when purchasing. FEDERAL TELEPHO^MaNUFaCTURING CORPN. ^federal ' StandaidRADIO1^"^ Factory-Mounted-— Ready to Wire You buy AlL'Amax Senior with all the parts properly mounted on panel and baseboard. Wire it in one delightful evening. .... Price $42.00 /UL'AMAXjuNioR(i-tube) Price. $22.00 Ten cents will bring you the RADIO KEY BOOK. Upon request we will include wiring blueprints of ALLAMAX SENIOR or JUNIOR. All-american Radio Corp. E. N. Rauland, President 2640 Coyne Street Chicago Win an ALL-AMAX Set —by submitting a SLOGAN. Ask at Your Favorite Radio Store.