Radio today (Apr-Dec 1939)

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Centraiab UNIVERSAL SPLIT-KNURL REPLACEMENT CONTROL Sh! It's a dank dark secret . . . known only to several thousand service men . . . it takes a special shaft to fit the knobs on many of the new (1938-39-40) sets. So, instead of tearing your heart out thinking up new cuss words, get in touch with your nearest Centraiab jobber for a Universal SplitKnurl control with the shaft that cuts as easily as butter. Shaft is brass — 3%" long from mounting surface. For switch type add Midget Radiohm switch covers K155, K156, K157, or K158. Div. of Globe-Union /ncMILWAUKEE. WIS. Urn kwkepAOikuU Philco station setter ■k New wireless station setter for aligning receivers having pushbutton tuned stations. Eight buttons on the aligning oscillator are pressed one at a time, and the corresponding station button on the receiver is padded until the signal from oscillator is heard. Philco Radio & Television Co., Tioga & C Sts., Philadelphia, Pa.— Radio Today. Weston cheek-master k Portable test instrument includes fundamental servicing facilities, and tube checker. Voltage is measured in five steps from 7.5 to 1,000 volts AC or DC. Current ranges from 1 to 100 ma. Resistance to 10 megs in 4 steps. Tube tester handles all receiver tubes including loktals, gas rectifiers. Noise, short, and leakage may be tested. Model 774. "Weston Electrical Instrument Corp., Newark, N. J. — Radio Today. DuMont oscilloscope ■k Two new models 175 and 175A are available with wide range sweep amplifiers to cover television frequencies. Control circuits added to discharge sweep oscillator make study of transient conditions simpler. Only one sweep trace occurs when transient condition trips sweep oscillator. Uses intensifier type cathode ray tube. Allen B. Du Mont Labs., 2 Main Ave., Passaic, N. J. — Radio Today. Fleron circuit tester •k "Saftest" circuit tester and polarity indicator for electrical and radio circuits from 80 v. to 550 v., AC/DC. Fully enclosed neon indicator bulb, protected with bakelite polystyrene housing. Test lead tips fully insulated, and indicator bulb is protected against higher voltages with special resistor. M. M. Fleron & Son, Inc., Trenton, N. J. — Radio Today. Consolidated tube tester •k Model 9,000 dynamic conductance tester with new improvements now tests 117-volt tubes and loktals. Counter or portable type. English reading scale. Consolidated Wire & Associated Corps., 516 S. Peoria St., Chicago, 111. — Radio Today. Hickok ohmeter -k Ultra low-range ohmeter has two scales 0-6 and 6-600 ohms with error of approximately 1 per cent. Special low resistance test leads of No. 6 stranded wire are used on model 4975S. Operates from three self-contained flash light cells and accuracy is not affected by changes in battery voltage. Hickok Electrical Instrument Co., 10514 Dupont Ave., Cleveland, Ohio.— Radio Today. 50 RADIO TODAY