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Projection Engineering, July, 1930
Page 3
A NEW
POWER LEVEL INDICATOR
For measuring and monitoring power
level in all kinds of voice transmission
and recording circuits
RANGE -10 DB to +36 DB
Engineers and Technicians: Bulletin
"P-100-L" gives a complete description
Send for your copy today
Price $60.00 '
THE maintenance of the proper power level in all parts of a system is facilitated by the use of a power level indicator. The Type 586 Power Level Indicator is especially valuable because of its portability, low cost, high accuracy, and freedom from frequency errors. It requires no batteries.
The meter is a copper-oxide-rectifier voltmeter, properly damped to minimize " over
shooting" on sudden surges. The "multiplier" is an L-type resistance network which serves to extend the range of the meter and to maintain the input resistance constant for all settings and for all frequencies to at least 7000 cycles.
Although the instrument is calibrated for 500-ohm lines it may be used with lines of other impedance without difficulty.
(T+O
GENERAL RADIO COMPANY
CAMBRIDGE A, MASSACHUSETTS
Racon Horns & Units are covered by U. S. Pats. Nos. 150/711 — 1501032
— 1577270 — 73217 — 7321
— 1722448 171 1514.
Air Column slightly less than 10 feet. Dei'th 30 inches. Bell 30x40 inches. Weight 30 pounds.
Innumerable Theatres Are Equipped With RACON Speakers . . . Because
Products are leaders in the industry
Amplifies as perfectly as the parent horn, No. 4320, on both speech and music.
Yes, you'll find the same full, rich tones of musical reproduction and the same clearness and distinctiveness of speech that is only possible with Racon Horns and Units.
Patented non-vibratory, non-porous material and construction, plus light weight, which makes for perfect results and maximum convenience.
These outstanding features of Racon products have made imitation and competition impossible.
Protect yourself against patent infringement suits by using Racon Horns and Racon Units, as these are fully protected by patents.
Improve Your Sound Equipment with Racon Speakers and Watch Results!!
Our Latest Catalog is Yours Upon the Asking
RACON ELECTRIC CO., Inc.
Specialists in Acoustic Chambers 18 to 24 WASHINGTON PLACE, NEW YORK W^SS f^"/ ^
Racon Giant Electro-Dynamic Type Horn Unit