The talking machine world (July-Dec 1928)

The Newest in Radio straight resistance coupler! with a 250 power tube in the output. Cabinet of burl walnut. Model 32 as shown, $295; in table form, $215. Fada: (1) Model 70. (3) Model 31. (3) Model 50. (4) Model 11. (5) Model 30 F. A. D. Andrea, Inc., Long Island City, N. Y. Fada Model 11, $135; Model 30, $187.50; Model 31, $235; Model 50, $225; Model 70, $340. These models were described, and other models of sets and speakers both illustrated and described in the RMA Trade Show section in the June issue. Kolster Radio Corp., Newark, N. J. Magnetic cone reproducer, model KG, table type, $35. Kolster console and table model receivers, AC. DC and Kolster Magnetic Cone Reproducer battery operated types, were described and illustrated in the RMA Trade Show section in the June issue. National Carbon Co., New York City. Eveready AC receiver, 7 tubes, in maple cabinet of natural maple finish. Eveready loud speaker unit shown on Eveready AC Receiver and Speak 'r table at right. Other Eveready sets, AC and battery operated types, were illustrated and described in the RMA Trade Show section in the June issue. Grid Leak Clarostat Clarostat Mfg. Co., Inc., Brooklyn, N. Y. Formerly American Mechanical Laboratories. Grid Leak Clarostat, for micrometric control of detector action, as well as grid leak functions in general. Resistance of 1/10 to 10 megohms in several turns of knob. Is silent and holds any adjustment indefl nitely. Especially desirable in shortwave reception. Also recommended for AC detector tubes and grid ieaK of resistance and impedance coupled amplifier. Table type Clarostat and Clarostat light socket antenna plug, were illustrated and described in the RMA Trade Show section in the June issue of The World. Radiola 51 Radio Corp. of America, New York City. Radiola 51, a socket-power receiver in a console cabinet with enclosed loudspeaker. Employs the radio circuit and power unit of Radiola 18 in combination with the 100-A cone type loudspeaker. One UY-227, a UX171-A, a UX-280 and four UX-226 Radiotrons are employed. Cabinet is of matched walnut finish. Lists at $195 without tubes. Browning-Drake Model 32 Browning-Drake Corp., Cambridge, Mass. New Browning-Drake 1929 AC receiver. In either table or cabinet form. Radio frequency end of the set uses four tuned circuits operated by a single control without any auxiliary tuning devices. The audio circuit Is Splitdorf Salem Model Splitdorf Radio Corp., Newark, N. J. The Salem, $575 — $150 extra for bookcase top ; the Avon, $290. Members of Splitdorf Avon Model the "Senior" group of Splitdorf models described last month. The Corao and Devon models illustrated in the June issue of The World. Corwico AC Adapter Harness Cornish Wire Co., New York, N. Y. Corwico AC Adapter Harness for converting battery operated sets of six or less tubes to house current AC without rewiring. Separate harnesses provided for RCA type and Arcturus cable type tubes. Adapters supplied with an RCA type harness. Ample provision made for "C" biasing and volume control supplied with all harnesses. Type "R" Adapter Harness for RCA type tubes, $8; type "A" Adapter Harness for Arcturus Cable type tubes, $5. Amrad Concerto The Amrad Corp., Medford Hillside, Mass. The Concerto, $320; The Sonata, $475. These models as well as the two others comprising the Amrad Amrad Sonata Symphonic Series were described in the June issue of The World. The Nocturne and Opera models were illustrated last month. Windsor Speaker Model 260 The AVindsor Furniture Co., Chicago, 111. New all-wood speaker, with balanced neavy reed unit and special tone filter. Windsor table speaker shown is Model No. 260. List price $30. Fur Windsor Reproducer Unit Model 255 nished in solid walnut, antique finish and brown and gold stippled finish. Windsor reproducer unit complete with tone filter in chassis form with plain wood case. Size 9!4 inches square, by 6 inches deep. Model 255, price $15.00. Arcturus Radio Co., Newark, N. 3. Arcturus type 22 AC shielded-grid tube; amplification constant, 400; mutual conductance, 445 microhms ; plate to control grid capacity, 0.04 micromicrofarads; filament voltage. 15.0: heater current, 0.35; plate voltage, 135; shield grid voltage, 30.0: control grid bias 1.0, and plate impedance 900.000 ohms. Tube is recommended for gen eral amplification purposes in the conventional r.f. and a.f. circuits. 90