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RADIO BROADCAST ADVERTISER
572-a
EFFICIENCY
On Long or Short Wave-lengths
For 2 to 60 meter receivers, such as are being built at the Brightson Laboratories to communicate with WNP, the McMillan expedition, the tubes must be dependable. They must be well matched, noiseless, and have a high amplification constant. Ordinary ununiform tubes cannot be expected to work efficiently on such short wavelengths.
Brightson True Blue Tubes have been developed with characteristics making them more efficient on low wavelengths than any other tube available to the amateur. Constant short-wave experimentation in the Brightson Laboratories, has shown the possibility of making a tube, which, while more efficient than ordinary tubes on broadcast wave-lengths is also more efficient on extremely low wave-lengths. A mutual conductance value, efficient on very low wave-lengths, will not function
properly on high-powered low frequency work. Brightson True Blue Radio Tubes have that happy medium which fits a tube for both types of reception.
10-Day Return Privilege
Unless True Blue Tubes prove interchangeably uniform, noiseless, crystal clear in tone and the handsomest, finest quality tubes you have ever used, you can return them in ten days for refund.
60-Day Guarantee
Whether you buy one True Blue Tube or a set of three, five, six, or eight in a safety case, each individual tube is covered by its own Brightson guarantee. If within 60 days a mechanical defect prevents any True Blue Tube from operating perfectly, you can return it for replacement.
If your dealer does not stock True Blue Tubes write us direct. Prices, 6 volt type "power Plus" for small sockets: "Standard" for large sockets, #3.50 each.
BRIGHTSON LABORATORIES, Inc.
Waldorf-Astoria Hotel 16 W. 34th Street, New York City
Philadelphia Office, 50 N. Eleventh St., Philadelphia, Pa.
lAr Tested and approved by Radio Broadcast