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Schematic of Philco's 1937 model 37-60 set employing "G" series tubes.
NOISE SILENCERS VS. GOOD ANTENNAS
* Much ado about noisesilencing circuits has created impression that the devices of the J. J. Lamb type will eliminate all noise and static. Truth in matter is that it will eliminate noise which consists of extremely short impulses separated by relatively long periods of silence. Also the crashes must be of greater strength than the signal being received.
While the device is ideally suited for code reception and other special purposes, it does not seem to be a source of income for the serviceman.
In order to sell such a customer such a device, much emphasis must be placed on the noise reduction characteristics. Then when the device has been installed, it will be found that some of the noise still exists — that type of noise that the silencer will not remove. Result is that the customer is not satisfied — particularly when the device costs upwards of $10-15.
Logical approach in noise reduction as far as customer is concerned, is to recommend installation of noise reducing antenna system — thereby providing signal pick-up in a relatively noise free area. Even more effective is the installation of filters at the sources of noise, if they can be found; but a modern antenna is usually most practicable.
NOISE ELIMINATION
{From page 28)
circuits. Line filter chokes should be able to carry the current required by the device — it is usually stated on the nameplate. Condensers should have a rating much in excess of the peak line voltage. Eemember that 115 volts AC has a peak value of 163 volts. Also voltage surges several times this value may occur.
Such difficulty as defective line power transformers, dirty insulators, bare wires, and telephones should not be remedied by the serviceman. A telephone call to the utility company will usually give immediate results.
WANTED 2QOOO author.»o
TO INSTALL WINCHARGERS
Millions will be paid authorized service men this year for installing Winchargers, the wind-driven battery charger that enables farmers to operate their radios for 50c per year. Wincharger is new, beneficial and profitable to the service man. Each installation charge varies from $5.00 to $15.00, plus material. Tens of thousands of these units are already in use — more being installed every day. Get your share of this profitable business right now — write for your service manual today.
WINCHARGER CORPORATION
Manujaci urers of 32-volt Equipment Since 1927 2700 HAWKEYE DRIVE SIOUX CITY, IOWA
• "\OISEOIASTER" is a modern antenna .system designed to cope with the noise problem. It fits any set in any location. It picks up and clarifies weak oversea signals, eliminates man-made static* makes every set a BETTER set. Satisfactory for BROADCAST as well as for shortwave band reception.
Send for complete details of this and other CORWICO units
CORNISH WIRE CO., Inc.
30 CHURCH ST., NEW YORK CITY
CORNELL-DUBILIER
C-D condensers, recognized leaders in the field, are forging ahead stronger than ever with a clean-cut sales policy, quality merchandise, fair prices and dependable service. • Bank with the winner! The most complete condenser line in the world. « ELECTRO LYTICS • PAPER • MICA • DYKAN0L.
Write today for complete details.
CORNELL-DUBILIER
CORPORATION
4360 BRONX BOULEVARD NEW YORK
May, 1936
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