Radio Broadcast (May-Oct 1925)

RADIO BROADCAST ADVERTISER 447 ACH TUNING INSTRUMENT Using Expensive WORM GEAR Why the A.CH. is different 3 in. DIAL **A£ii > (t56-to-l ) 4 in. DIAL a»ACfl >■ (215-tO-l ) Price 3-inch size $8.50 Price 4-inch size $5.00 Regular fitting 5/16 »haft. x/4 and 3/16 5c each extra If not carried by your dealer, deduct 33-f%> his discount, and we will send you your required number of dials. Add 19 cents each for postage and packing. Complete line of parts can be furnished on the same basis. A. C. HAYDEN CO. BROCKTON MASS., U. Si A. There's A Reason! The fine, clear tone and volume of the Kellogg Symphony Reproducer is due to the Kellogg unit with the magnetic diaphragm control. This exclusive Kellogg principle has produced wonders in the accurate reproduction of voice and music; piano music is unusually fine, the lowest tones of the saxophone to the highest of the violin are as clear as a bell the soprano voice can really be admired. Observe the rigid construction of this unit, the exactness of every detail, the size of the magnets. The unit is the reason. See one at your dealers to-day. ^ KELLOGG SWITCHBOARD 8C SUPPLY CO. 1066 West Adams St., Chicago, 111. With every Kellogg radio part, Use— Is The Test. NOT HURT by boiling or freezing Sangamo Mica Condensers AN engineer engaged in research work for XjL a large company needed condensers that would stand severe use and stay accurate. . So he took a Sangamo mica condenser and kept it in boiling water for several hours. Then he had it frozen into a cake of ice. When tested afterward, he found no change in the capacity. Even this severe treatment had no effect upon its accuracy ! Your re' ceiver will work far better with condensers that are accurate — and stay accurate. Sangamo condensers are approved by every nationally recognized radio laboratory. They are guaranteed to be accurate within 10 per cent, of marked capacity and to sustain that accuracy. Soldering does not change the capacity. Neither does dampness nor salt air. Their neat appearance appeals to those who are particular about good workmanship ; solidly molded in smooth brown bakelite, all corners rounded, ribbed for mechanical strength, and decidedly easy to solder. Made in all capacities from .00005 to -0I mfd. Prices are moderate. Supplied with re' sistor clips for 10 cents extra. Good radio stores carry Sangamo Mica Condensers or can get them quickly from jobbers. Insist! m Sangamo Electric Company Springfield, Illinois RADIO DIVISION, 50 Cfmrch Street, New York SALES OFFICES— PRINCIPAL CITIES For Canada — Sangamo Electric Co. of Canada, Ltd., Toronto. For Europe — British Sangamo Co., Ponders End, Middlesex, Eng. For Far East — Ashida Engineering Co., Osaka, Japan 1310-6 Tested and approved by Radio Broadcast