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490 RADIO BROADCAST MARCH, 1927 iiiiiiiiiiiiiiiiiiuini ••• iiiiii •iiniiiiiiii :.,• ,1,1 in THE LIST OF PARTS Ti, Li, d—Thordarson Power Compact, No. 71 . $15.00 Ci—Potter Condenser Block 12.50 Ci—Polymet 4-Mfd Condenser 3.50 G—Tw9 Polymet i-Mfd. Condensers .... 2.00 Three Airgap Sockets 1.80 Lynch Double Mount .50 Two Lynch Single Mounts .70 R;—Lynch Equalizer No. 4 i.oo R<—Lynch Metalized Filament Resistor, 0.05 Megohms .75 R«—Tobe Veritas, 20.000 Ohms 1.10 Rs—Tobe Veritas, 10,000 Ohms 1.10 Ri—Tobe Veritas, 2000 Ohms 1.10 1-3—Thordarson Impedance, Type R-ig6 . . . 5.00 Ta, Ti—Two Thordarson Type R-2OO Transform- ers . 16.00 R2, Rs—Two Clarostat Variable Resistors . . 4. so Base-Board, Wire, Posts, C Battery .... i.oo ux-20i-A Type Tube 1.7; ux-i7i Type Tube 4 «> Raytheon B H Rectifier Tube 6.00 TOTAL $79 80 RADIO BROADCAST Photograph Filter Chokes Input from Det. A TRANSFORMER-COUPLED AMPLIFIER-POWER SUPPLY DEVICE Designed to supply B voltage for the whole receiver. The filament of the output tube is supplied with a. c., and C voltage is also obtained from the mains for this tube. The circuit diagram gives the connections and constants used in the circuit. Above is a photo- graph of the complete unit which is unusually compact I1H()I1!IIIIUI!1I!IIIII1II1I!B1I1I«^ li!H!l!l!l!lllll!lllill:illli,li:,ll:,l. ,..,... .lil.l:;,ll[l!HO^Hi^HiHHHlBniH!!lll!il!ll!l!ll!llillllllillll!lllirljl':': , IIIIUIII1 ,,: i|l!!IIUHHBHHMlHMHHBnBHMMMMHMii^HMMMHHMMMMBI^HM ANOTHER AMPLIFIER-POWER DEVICE The circuit diagram which applies to the amplifier device illustrated here is substantially the same as that shown in the box above. The 5-ohm resistance strip specified in the list of parts should be connected in series with one of the filament leads of the power transformer to drop the voltage to 5 volts. The potentiometer, Ris, is connected across the filament terminals of the power tube socket in order to ob- tain the equivalent of a center tap. The total capacity in the filter section is 8-mfd. as opposed to the usual 12-mfd. RADIO BROADCAST Photograph THE LIST OF PARTS Ti—General Radio Power Transformer . . . $10.00 Li—General Radio Filter Chokes 10.00 Ci—Four American Electric Filter Condensers, 2 Mfd 7.00 Cj—Two Tobe o.i-Mfd. Buffe, Condense-s . . 1.40 Cs—Two American Electric Bypass Condensers, l Mfd 2.40 La—Thordarson Choke, No. R-io6 5.00 O—Tobe Fixed Condenser, 4~Mfd 3.50 Ti, T2—Two Rauland Lyric Transformers. . . 18.00 Three Sockets (General Radio, Benjamin). . . 1.75 R?—Rheostat, 10 Ohms .75 Resistance Strip, 5 Ohms (Taken from Old Rheo- stat) Ra, Rs—Two Electrad Royalty Resistors, No. 2 and No. 3 3.00 Lynch Double Resistor Mounting .50 Ri—Tobe Veritas Resistor, 2000 Ohms . . . 1.10 Ri—Durham Metalized Filament Resistor 0.05 Megohms .75 Two Electrad Short Jacks .50 Binding Posts .45 Bakelite 3.00 Garfield Brackets 1.25 Ris—Potentiometer, General Radio, Type 214 . 3.00 UX-2OI-A Type Tube 1.75 ux-171 Type Tube 4.50 Raytheon BH Rectifier Tube 6.00 TOTAL $85.60 RADIO BROADCAST Photograph