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RADIO BROADCAST ADVERTISER
1 . Accurately wound Coils of
maximum durability
2. Dependable deliveries
3. Prices commensurate with
quality of product
For the manufacturer who prefers his coils produced by commercial winders, the Coto Coil Co. is prepared to render an exceptional service. Our long experience in this field and our equipment of "Universal" coil windingmachinery, enables us to make prompt shipment of wire windings either simple or complicated in construction. Requests for quotations and samples will have the prompt and careful attention of our engineers.
COTO COIL CO.
87 Willard Ave. Providence, R. I.
Whether you plan to build or to buy a receiving set, it will pay you to know something about the "insides" of radio, s booklet gives you the "inside dope" on some of the recent inventions embodying the latest ideas of radio engineers. In this bulletin is full information about the
Premier "HEGEHOG"
Audio Transformer
Ratios 1 to 3, 1 to 4, and 1 to 5, $3.50
Ratio 1 to 10 $4.50
This light weight audio transformer has earned a place in the very front rank for its remarkable volume and pure, natural tone. It is 100% self-shielded against foreign noises. Its small size is a surprise to everyone. It cuts the space requirements for audio transformers in two. This is a big advantage in portables and makes it ideal for neat and compact wiring. FREE HOOKUP DIAGRAMS also sent on request. All popular types. Address
PREMIER ELECTRIC COMPANY
3812 Ravenswood Avenue Chicago
vamtm
Quality Radio Tarts
THE NEW
UNCLE SAM
"CIGAR BOX "COIL
SMALLEST TUNING COIL IN THE WORLD
Size 2% x 2Vz in.
This coil is so small it can be built in a cigar box. Just the thing for portable sets for vacations and outings. When used with an Uncle Sam Antenna Coil, it gives a four tube tuned radio frequency set that will break through all locals, that has unbelievable selectivity and will get from coast to coast on a loud speaker.
P D J7 J7 Ask your dealer or send us four M •*»■•*-»•*-» cents in stamps for wiring diagrams o} circuits in which these units can be used.
UNCLE SAM ELECTRIC CO.
219 East 6th St. Plainf ield, N. J.
'jf Tested and approved by Radio Broadcast ^