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You Can Sell
OUTDOOR RADIO
This Summer
▼ This compact portable battery radio with 4 tube superheterodyne circuit weighs only SO pounds, complete with six-inch speaker. Batteries plug in — no wires to connect. Attractive cabinet, choice of finishes. Write forspecial Authorized Dealer Franchise covering portable radio and famous Ansley Dynaphone phonograph combinations.
ANSLEY RADIO CORPORATION 240 West 23rd Street New York, N. Y.
ANSLEY
PORTABLE BATTERY
RADIO
Ken-Rad
RadioTubes
DEPENDABLE LONG LIFE
Our complete dealer sales plan opens the way to better business. Write for it today.
Gen in in'
Glass or Metut
Radio Tubes
Division of The Ken-Rad Tube and Lamp Corporation
0WENSB0R0 KY.
Also Mlrs. ol Ken-Rad Incandescent Elec. Lamps
SERVICE NOTES
HIGH-GAIN MIDGET SUPERHETERODYNES
* Circuit of the Model 40 Fairbanks-Morse 4-tube superhet is fairly representative of the midget sets employing a regenerative second detector in place of an i-f. amplifier and what is said here will apply to many similar sets. Also a pentode is used as an oscillator-first detector.
Heavy portion of circuit shows regenerative stage — energy is fed back from the plate to the grid coil via a small variable coupling condenser, size of which determines amount of regeneration. The 10,000 ohm resistor in the plate circuit acts as an r-f. choke so that the energy will feed back instead of going into audio system.
When lining up the i-f. the feed
UTRH UNDID PRODUCTS [0.
back condenser should be set so that no oscillation is present. The condenser across the i-f. transformer should be adjusted for maximum response, then the regeneration condenser advanced until the set just oscillates. Back up the regeneration condenser slightly (so that set does not oscillate) and check alignment of main i-f. condenser. Alignment of the r-f. portion of set is same as any other.
If this type of set (employing a pentode oscillator-modulator) refuses to operate or works intermittently, trouble is often due to a poor 6C6 tube. This type of oscillator is usually critical as regards the oscillator tube — tube tester will often show tube to be satisfactory — best method is to try other 6C6 tubes in oscillator socket.
OHlERns ST. [HICDCfMU.
URPC 820 RT5 CHICAGO ILL
SEVEN TIMES UTAH HAS BEEN FIRST WITH AN IM P0RTANT VIBRATOR IMPROVEMENT STOP NO WONDER IT'S THE GUARANTEED VIBRATOR
UTAH RADIO PRODUCTS CO
TEAR OUT THIS AD-PIN TO YOUR LETTERHEAD AND MAIL TO DEPT. R. T. FOR COMPLETE DETAILS AND FREE CATALOG
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