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RADIO BROADCAST ADVERTISER
441
CRYSTAL CLEAR TONES
T
ON
Carborundum ^Detector
■»here is no denying the pure true quality of crystal reception.
And you can get such reception on any set without the fuss and worry of a nervous Cat's whisker jumping off the sensitive spot.
The Carborundum Stabilizing Detector Unit has revolutionized crystal detection. It is built around the Fixed Permanent Carborundum Detector— no Cat's whisker— no adjustments— retains its sensitivity and simply can not burn out.
The Stabilizer gives you a resistance controlling feature through which the Detector can be made to match the
SET
Stabilizing cilniH
impedance of any circuit. Simply turn the potentiometer knob.
The addition of an ordinary flash light dry cell gives the necessary booster voltage.
For greater sensitivity — greater distance—but above all for the reception of tones of natural quality equip your set with The Carborundum Stabilizing Detector Unit — it improves any set.
IN U. S. A.
$3.50
Dealers or
Direct
The
/ Carborundum / Company Niagara Falls, N.Y.
Please send free Hook-Up Book D-2.
THE CARBORUNDUM COMPANY, NIAGARA FALLS, N. Y.
Sales Offices and Warehouses in New York, Chicago, Boston, Philadelphia, Cleveland, Detroit Cincinnati, Pittsburgh, Milwaukee, Grand Rapids
Carborundum is the Registered Trade Name used liy The Carborundum Company for Silicon Carbide. This Trade Mark is the exclusive property of The Carborundum Company. *
/ Name^
/ Street
City
State
ROBERTS FANSATTENTION
RADIO BROADCAST,
For One Dollar you can possess a book giving complete constructional specifications and wiring data, together with much additional helpful information on all the Knock-out Reflex and several Roberts Reflex Receivers.
Another Dollar brings to you Radio Rroadcast's Knock-out FourTube Roberts Receiver full-sized blue-prints.
Send your Dollar to Booklet Department Garden City, N. Y.
ALL TYPES A "SPEED" TUBE FOR EVERY RADIO NEED
You will never want anything better than
The most perfectly balanced
tubes produced JOBBE RS DEALERS —
MANUFACTURERS A "Speed" Franchise is valuable. It enables you to obtain the better business at a greater profit. Write for details.
X 200
The New Special Power Detector
Greater Sensitivity Longer Distance Finer Tonal Quality
Uniform Quality
Less Replacements
CABLE SUPPLY COMPANY, Inc.
Manufacturer — Distributor
Executive Offices 907 Broadway New York City
-fc Tested and approved by Radio Broadcast -fa