Radio today (Sept 1935-Dec 1936)

^ Roto-Rcuvqen TUBE TESTER and SET SERVICER >*= AN two months, what a welcome! Simpson Radio Instruments, with the ingenious Roto-Ranger* scales were unquestionably the sensation of the I-R-S-M Show, and in the sixty crowded days since their announcement they have been hailed by service men everywhere as the one big development in recent years. The latest addition to the Simpson line is illustrated here — the new Simpson Model 220 Tube Tester and Set Servicer — an A. C. operated tube tester and a point to point set servicer combined in one versatile instrument. As in other Simpson Roto-Ranger equipment, the new Tube Tester is equipped with independent scales synchronized-with the circuit selector as described below. The Roto-Ranger feature permits the use of three distinct English reading scales with the correct load resistances to facilitate close reading of the three classes of tubes — battery types, cathode types and diodes. Tubes are tested hot so as to locate shorts due to thermal expansion. Any possible pin arrangement, including the location of both filament terminals is provided for by the filament return selector and flexible unit switching arrangement. A spare socket provides for any radical changes in tubes that may develop. A switch in the lower right hand corner enables you to check voltage at any time without disturbing the circuit selector — a real time saver. $ Testing for shorts is a simple matter of turning the circuit selector to "short check" and manipulating the toggle switches at the bottom of the panel. Two "Good and Bad" dials cover condenser testing — one indicates the condition of paper and mica condensers; the other shows the allowable leakage for electrolytic condensers at various capacities. Both indicate exact leakage in Megohms instead of merely detecting the general condition as in conventional instruments. There are three very practical resistance ranges: The 0-100 ohms range (15 ohms center) measures resistance of coils and even detects poor soldering, and there is also an 0-100,000 ohm range (3500 ohms at center) and an 0-100 megohm scale with 1 megohm at center — a complete range from .2 ohms to 100 megohms. Voltage ranges include D. C. 0-8-300-1000 volts. All voltage ranges are furnished with resistance of 2500 ohms per volt — a practical combination of ranges for all test work. See the finer workmanship of this and other Simpson Instruments — the unmistakable signs of greater precision — the clear, independent scales. Then consider the fact that these instruments actually cost less than equipment which cannot match their design, beauty or utility. This will be your final reason for using Roto-Ranger servicing instruments. 57? IET PRICI Another plus-quality Simpson "Roto-Ranger" achievement — the RotoRanger Volt-Ohm-Milliammeter. COUPON BRINGS FACTS Ask your jobber or mail the coupon below for information. What is Roto Raj\q "Roto-Ranger" is the appropriate designation of the basic unit which is incorporated in the Simpson Set Servicer, Tube Tester, Volt-Ohm-Milliammeter and similar instruments. This ingenious unit consists of a selector switch which is perfectly synchronized through a precisely built bevel-gearing with a drum containing the twelve scales corresponding to the twelve selector circuits. As the selector switch is the / n / moved through its twelve positions, the drum is matically rotated by means of the gearing so that proper scale for the particular circuit appears the aperture of the panel. Here is truly direct reading. This unit, which marks the greatest / a\" advance in reoent years, is a patented and ex / / elusive feature of Simpson Instruments. There nly one "Roto-Ranger — Simpson!" Kinzie Street, Chicago. II Mv Jobber Is October, 1936 51