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RADIO BROADCAST ADVERTISER
COILS
These are needed for the
Armstrong SuperRegenerative Circuit
5-Millihenrie Choke Coils $2.50 100-Millihenrie Choke Coils 3.00 12000-Ohm. Non-inductive
Resistances ---- 3.00 1250-Turn Honeycomb Coils 2.00 1500-Turn Honeycomb Coils 2.50 .005 Micon fixed Cond. .75 .0025 " " " .50
Attractive discounts to dealers and jobbers and immediate shipments.
These coils are guaranteed correct to within 2% and may be returned within six days if found unsatisfactory.
DURHAM & COMPANY
Radio Engineers
1936 Market St. Philadelphia, Pa.
EVERETT
DOUBLE RADIO
PHONES
"Not the loudest hut
the clearest" Light in weight, withstand amplification without distortion.
AT ALL DEALERS _
320 Broadway
New York
35c Each;
3 for $1.00
Na-ald
Genuine Condensite Dial
The dial that runs true
Numerals engraved on bevel and knob so shaped that fingers do not hide them. Thin edge with clear graduation to make reading easy. Concealed set screw in metal insert. Will not warp or chip. Finish and enamel permanent.
Low price with this quality possible only through automatic production methods.
Special dealer and jobber proposition — an opporlunilyt
Alden-Napier Co.
52 Willow St., Dept B. Springfield, Mass.
Type R2— $4.25 Type R3— $4.50
"All-American" Audio Frequency AmplifyingTransformers
Two Types — Ratio 1 0 to 1 . (TypeR3) Designedfor 1 st. stage. Ratio 3 to 1 (Type R2) for 2nd and 3rd stages.
Frequency Transformers. 35 SaDearbom Jt,(.llica90illl.