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.RADIO BROADCAST ADVERTISER
Precision manufacturing
safeguards correct design
THE most advanced principles of design, the most unique features of construction, cannot in themselves produce tubes of uniform characteristics. Manufacturing accuracy must measure up to engineering skill in every respect.
The unvarying excellence of Arcturus Tubes is due as much to painstaking production methods, rigidly adhering to accurate standards, as to unique design. This rare combination has gained widespread recognition for these exceptional tubes.
By inspecting every tube 137 times, approving only those tubes whose characteristics fall within the narrowest manufacturing limits, Arcturus has set a standard of uniform quality unsurpassed by any tube on the market today.
AIRCTUIRU
BLUE loifi&iPt TUBES
ARCTURUS RADIO TUBE COMPANY ~ Newark, N. J.
Testing Screen-Grid Tubes
The Type 443 MutualConductance Meter tests triodes and screengrid tubes with equal ease. Manufacturers, jobbers, and dealers are using this instrument to make inspection tests.
It is compact, easy to operate, and thoroughly reliable.
Send for Descriptive Literature
GENERAL RADIO COMPANY
30 State Street Cambridge, Massachusetts
274 Brannan Street San Francisco, California
A
Beautiful NEW Panel Plate
for the Famous
HAMMARLUND DRUM DIAL
Richly embossed, pebbled bronze in the modern mode. It has grace and charm appropriate to the superb dial mechanism back-panel that delighted thousands of set builders last season.
The control knob can be mounted anywhere on the panel. Illuminated scale.
Write Dept. RB9 for Details
HAMMARLUND MFG. CO.
424-438 W. 33rd St. New York
"Retted 'Radio'
ammarlund
F>FtE C IS ION
PRODUCTS
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"What an UNUSUAL Way
to Wind a Resistance"
—And a BETTER way too, as is witnessed by its almost universal use and endorsement by radio engineers and manufacturers the world over. Here's another unusual and exclusive feature, the
ADJUSTABLE SLIDING CLD?
which enables instant adjustment to the exact resistance value desired.
The resistance wire is firstwound on a small asbestoscovered copper core. This is then wrapped around a grooved fire-clay base. More of heavier resistance wire is thus wound in smaller space — and more of its surface is exposed and air-cooled* Hence longer-lasting — more accurate. Sizes and ratings for all standard Eliminator and Power Pack use.
Variable models also, with fine knob adjustment — the contact moving ENDWISE over the wire with less wear and greater smoothness. Thoroughly air-cooled. Perforated metal shield, onehole mounting. 22 .t3^ stock sizes.
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3 0 6 •
• SEPTEMBER 1 9 2 9 •