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836
RADIO BROADCAST ADVERTISER
AT LAST YOU CAN TELL WHAT YOUR TUBES WILL DO
SUPERADIO
VACUUM TUBE
DYNOMETER
This revolutionary Meter measures easily, with positive accuracy, the power of any vacuum tube on the market. No more do you have to buy a "pig in the poke." Now, you can get that "best" audio or radio frequency amplifier orethat "right" detector tube. And you can always duplicate your tubes when it comes to renewals. Insist on Tested Tubes.
Every Set or Tube Manufacturer, every Jobber and Dealer will want this necessary Meter. Reliable Representatives wanted. Write for details.
only $17.50
Complete with headphones and plug
uper-heterodyne £m.JL JL
Here is the ideal Kit to build, the new Super-heterodyne. Marvelous results. Contains I Antenna Coupler, I Oscillator Coupler, I Special Variable Condenser, I Tuned Filter Transformer, 3 Matched Intermediate Transformers and all necessary hardware with diagrams, layouts, and complete Super-heterodyne Treatise by Louis C. Billotte. Write to-day for information.
D e W I TT -LaFRANCE CO. INC
54 Washburn Ave., Cambridge, Massachusetts
Boston Representative: Martin, Hartley & Dewitt Sales Co., 99 Bedford St.
Chicago Representative: William A. Welty & Co., 36 So. State St.
SPEAKER
with
CONCERT UNIT
The Heart of the Speaker
Large size and scientific construction of the Concert Unit gives the remarkable tone values which combined with the special amplifying properties of the BURNS horn produce remarkable results. >
Burns horn is of distinctive design with pyralin flare in several handsome finishes.
Manufacturers
Jfmerican (§/edric Qmpawj
STATE AND 64TH STS. CHICAGO, U. S. A.
The Highest Form of Aerial Obtainable
BRACH
De Luxe Complete
Aerial Outfits
Here you have every needed part to the last screw for an antenna — all in one package — in one purchase — everything of the highest class, including
Brach Vacuum Lightning Arrester
$5.00 and $5.50
L. S. BRACH MFG. CO. NEWARK, N. J.
^ Tested and approved by Radio Broadcast -fa