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RADIO BROADCAST ADVERTISER
Accuracy:
TRUVOLT
An All-Wire Variable Voltage Control
Install Truvolt in the B'Eliminator you are constructing and vary your voltage exactly. A new type wire variable high resistance kept cool by its greater radiation surface — like an air cooled motor.
Develops but \ the temperature of other resistances of like size; hence is permanently accurate and lasts indefinitely. Positive metallic contact always and 30 exact readings of resistance.
Type
T-5 T-io
T-20
T-50 T-100
T-200
T'250 T'500
Resistance Ohms
o to 500 O to 1,000 O to 2,000 o to 5,000 O to 10,000 O to 20,000 o to 25,000 o to 50,000
Current Milliamperes
224 158 112
71 50
35 32 22.5
Price $3.50 each
All rated at 25 watts.
At Tour Dealers
Also a full line of Wire Fixed Resistances
Write for free Hook-up Circular
"This Is An Eliminator Year*
Dept. 14B, 175 Varick Street New York
ELECT RAD
Improved Reception
Get it with the
CARBORUNDUM
REG. U. S. PAT. OFF.
GRID LEAK
One certain way of getting better and clearer reception is to slip a Carborundum Grid Leak into your set. ^ Things will quiet down instantly. Carborundum Grid Leaks do not disintegrate — hence they are quiet. They are solid, fixed, dense rods of Carborundum. They assure an uninterrupted flow of current. They banish Grid Leak noises.
^ Carborundum Grid Leaks are tested at the maximum operating grid voltage, namely — 5 volts, and Resistors at 90 volts.
From your dealer, or direct Send for Hook-Up Booklet D-2
♦ ♦ !
THE CARBORUNDUM COMPANY, NIAGARA FALLS, N. Y.
Canadian Carborundum Co., Ltd., Niagara Falls, Ont. Sales Offices and Warehouses in New York, Chicago, Boston, Philadelphia, Cleveland, Detroit Cincinnati, Pittsburgh, Grand Rapids, Milwaukee The Carborundum Co., Ltd., Manchester, Eng. Deutsche Carborundum Werke, Dusseldorf, Ger.
V Carborundum ia the tteeistereil Traiie Name used 1 iy The Carborundum Company for Si I con Carbide. This Trade Mark is the exclusive property of The Carborundum Company
□y. J
RADIO PANELS
BAKELITE — HARD RUBBER
Cut, drilled and engraved to order. Send rough sketch for estimate. Our complete Catalog on Panels, Tubes and Rods — all of genuine Bakelite or Hard Rubber — mailed on request.
STARRETT MFG. CO. 521 S. Green Street Chicago, 111.
BROWNING-DRAKE BLUE PRINTS?
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Radio Broadcast Magazine
Booklet Department
Garden City New York
$1.00 per set
Independent Radio Corporation
Manufacturers of
Precision Radio Apparatus
1516 Summer Street Philadelphia
Ml
WHOLESALE
kWrite for my Big 1928 Radio Catalog -just off the press. Thousands T . . -mp of marvelous bargains in nation i arV a"y advertised goods. All the * V LATEST IN RADIOS and dfa on RSioN equipment. Lowest whole
All about trouble flndi.„. FREE Log and X igen*l V^AlER?
Gall Book and Cat-X^* Wanled. / iT^^S alog. Get your copy today. Send postcard now! American Auto & Radio Mfg. Co.
HARRY •sCHWARTZBKRG, PRES.
Dept. 1Z3 American Radio BIdg., Kansas City, Mo.