Radio age (Jan 1927-Jan 1928)

20 RADIO AGE for September, 1927 one inch apart. An extra binding post is shown in the photograph which may be disregarded. The set is ready for a test after all the connections are checked and re-checked. On turning on the light current to the . transformer and B eliminator, if one is used, there will be a very loud hum bursting out of the speaker. After the set "hums" for about a half minute (until the detector tube heater is white hot) the hum will suddenly subside, and then with adjustment of the potentiometer will disappear. The drum dial is then revolved until a station is heard on the upper part of the drum. But before tuning in your station loosen all of the adjustment screws of the alignment condensers which are between each set of plates. Screw down the adjustment screw nearest to the drum dial until the signal is the loudest; if the station gets weaker loosen the screw to the point where it will be loudest again. Xow make the same adjustment on the middle alignment condenser. In approaching the point of maximum signal strength the set may break into oscillation. In' that case set the stabilizing resistance to a point where the set will stop oscillating. The next alignment condenser is then adjusted, and in the same manner. After this adjustment turn the drum dial back and forth across the station, that is, so the station will be tuned in and out, and at the same time go over the condensers again until the loudest signal is heard, or until oscillations occur. It is a good idea to adjust the stabilizer to a position right below the point where oscillations start, and then make the alignment adjustments until oscillations start, then back off the stabilizer to stop the oscillations, and again make your condenser adjustments until oscillations occur, finally the further adjustment on the condensers will not induce oscillations (whistles), unless the stabilizer is turned up. The circuits will now be tuned to resonance at the high wave-lengths. If the coils are properly matched and the gang condenser is accurate the alignment should hold for the lower wavelengths. A slight re-adjustment will soon determine this. If re-adjustment is necessary to get the loudest signal it means that either the coils are not matched or the gang condenser is "off." During all these adjustments a small antenna of about twenty feet should be used. The total current consumed in the plate circuits is about fifty milliamperes. The average B battery eliminator will handle the set, though the voltage to the plate of the 171 tube will be less than 200 volts. It will be about 150. The bias regulation however, will be automatic, and adjust itself to any plate voltage. A B battery eliminator having about a 80 milliampere capacity is advantageous, and in a set where more than six tubes are used is absolutely necessary. October Supers Get the October Radio Age for illustrated articles on three of the latest superhet circuits. An important number. PEMLEI^ Radio Parts Are Specified in the AC Tube Receiver Drum DIAL The Remier Drum Dial gives a full 15 inc.-hes of dial space, divided into 200 divisions — 2 for each broadcast channel. easily removable and renewable. Call letters Spiral gear drive gives qi Socket and 6-volt lamp furnished for illumi Easily mouated, round drilled hole required for panel plate. The Remier Drum Dial will drive all standard makes of condensers either single or in gangs of one, two or three condensers. Mounting template i included in each carton. Right or left-hand mounting. Calibration strips are supplied for either clock-wise or counter cluck-wise rotation of dial. No. 110.— Remier Drum Dial— Price $450 Once more the quality and accuracy of Remier Radio Apparatus wins important endorsement. Again parts that are built for maximum service are used to give maximum results. Your Radio Age AC Tube Receiver deserves the improved reception which only Remier Parts can give. REM LET* Division of ' & DANIELSON MANUFACTURING CO. 260 First Street SAN FRANCISCO CHICAGO Eastern Warehouse, ELKHART, NEW YORK INDIANA 3-in-Line CONDENSER Complete insulation of each ith the Balancing Condensers are integral of conveniently located regulating screws. Ample space is allowed between sets of plates. Frame is die-cast aluminum with black crystalline enamel finish. The Three-in-Line Condenser can be mounted interchangeably with other Remier Condensers. Special staggered connection of plates makes it self-shielding, preventing interstage coupling. All insulation is of genuine Bakelite. Maximum capacity of each section, .00035 mfd. $1522 Twin-Rotor Condensers $5.00