Radio age (Jan 1927-Jan 1928)

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RADIO AGE for October, 1927 13 REMLER INFRADYNE AMPLIFIER "HO r jscoesnr xV 9 CABLC TERni/IAL Figure 5 — Wiring diagram of the "1928 Infradyne," showing also the color scheme for the battery cables formance this amplifier has not been changed in any respect from that of last year. Back of the bronze panel carrying the instrument controls is a pressed steel panel upon which are mounted the voltmeter, Infradyne Amplifier rheostat, two drum dials, and the oscillator tuning condenser. Located directly in back of the drums are the two rheostats for volume and sensitivity control. From the layout it is obvious that the assembly of this receiver is far from complicated, and perfectly symmetrical. The bottom of the pressed steel base is illustrated in the photograph, Figure 4. Since the holes are already drilled for mounting the instruments and running the wires the job of building the set is greatly simplified. All. the small parts used in the Infradyne receiver, including nuts and screws, wire, etc., comprise the Infradyne Foundation Kit, saving a lot of troublesome shopping for these odds and ends. The parts are as follows : Infradyne Foundation Kit — Parts List. Pressed Steel base Pressed steel instrument panel Bronze control panels Remler No. 110 Drum Dial (Righthand) with brace and lamp Remler No. 110 Drum Dial (Lefthand) with lamp Remler Type 659 Condenser Remler No. SO Sockets Remler No. 35 Choke Coils with special spacers Special coil and spacer 10 ohm rheostat, extension shaft and bushing (Frost) 2y2 ohm rheostat, extension shaft and bushing (Frost) 4 ohm rheostat (Frost) 2 ohm fixed resistor 4 ohm fixed resistor 6 ohm fixed resistor Electrad Type GS .00025 mfd. condenser Electrad Type P .00025 mfd. condenser 1 Electrad Type P .001 mfd. condenser 3 Electrad Type P .005 mfd. condensers 1 Special adjustable condenser Figure 4 — Bottom of the pressed steel base of the "1928 Infradyne" 1 4 megohm grid leak 1 Frost No. 953 Jack 1 Frost No. 954 Jack 1 Yaxley No. 69 Switch 1 "Antenna" binding post 1 "Ground" binding post 1 Bakelite terminal strip 4"x%"xMs" 2 Special bakelite terminal blocks 1 Battery cable 12 Lengths wire (colored as per code) Necessary screws, nuts, washers, soldering lugs, spacers and brackets. The rest of the units are the Remler No. 710 Radio Frequency amplifier and Antenna Compensator, two Silver-Marshall Type 220 Audio Transformers, one Silver-Marshall Type 221 Output Transformer, and a Western Model 506 or Jewell Pattern 135 0-5 volt voltmeter. A simple plan has been devised by the manufacturers for making up a cable harness. A full sized template is furnished showing the positions for the various nails on which the wires are wound to make up the panel. The plan is so simple that even a man who has had almost no experience whatever can easily complete the job.