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RADIO BROADCAST ADVERTISER
691
ClAROSTAT
O.K.'d by RAYTHEON—
and a host of other nationally known battery eliminator manufacturers.
— because Clarostat has no equal for voltage control in "B" Battery Eliminators.
— Only Clarostat gives you a range from practically sero to 5,000,000 ohms and a carry ing capacity of 200 milliamperes — a capacity ten times greater than that of any variable resistor.
To insure smooth functioning of your eliminator, go to your dealer and get a CLAROSTAT. It will give you absolute noiseless operation.
If your dealer cannot supply you, write direct.
American Mechanical Labs., Inc., 285-287 North Sixth St., Brooklyn, N. Y.
Special types for "A" and "B" Battery Eliminators for manufacturers.
MODERN "B" Power Supply
It's Better Because It's Modern
THE Modern "B" Power Supply is a perfected unit behind which is our unconditional guarantee of satisfaction.
It is an electrically correct unit. Into it has been built every element that makes for practicability. It can supply 150 volts, thereby permitting the use of big power tubes. An extra 9o volt tap provides for the use of peanut tubes. Possible moisture seepage is absolutely eliminated; electrical depression of elements is totally absent; several additional microfarads eliminate oscillation where oscillation is part of the inherent design and each unit is tested at 2500 volts.
In short the Modern "B" Power Supply will operate any receiver satisfactorily, even improving in most instances tone and quality.
Try it and be convinced! MODERN ELECTRIC MFG. CO.
Toledo, Ohio
these manufacturers we feel confident that the purchaser of any of these devices will find complete satisfaction from them — provided of course they are properly used.
To point out to the users of Raytheon tubes and accessory apparatus the proper methods of operation, the series of articles mentioned above will appear from time to time. These articles will present as much technical information as we believe will be of interest to home constructors as well as to dealers who handle our products. The experimental work in our laboratory as well as that conducted elsewhere will be digested and brought to the attention of those most interested in these articles, so that the products of the many manufacturers associated with the Raytheon tube will be used as intelligently and as successfully as possible.
It should be borne in mind that wherever possible new developments or improvements in the application of the Raytheon tube will be such that they will not entail changes in existing apparatus. Naturally, what the home constructor or the manufacturer who uses or sells Raytheon tubes wants, is something new that will increase the usefulness of his device without any changes, and every effort will be made to carry out this natural and defensible desire.
One of the first tasks to which the Raytheon manufacturers confronted themselves was the development of apparatus with sufficient power. The result has been possible through concerted effort, and now one can be assured that a receiver equipped with a Raytheon B eliminator will have adequate
RAYTHEON^
Tested and approved by Radio Broadcast jr