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RADIO BROADCAST ADVERTISER
Vacuum Tubes Do Triple Duty
With Erla Synchronizing Transformers
Perfect synchronization of received and reflexed r. f. currents make Erla radio transformers indespensable in reflex work. List, $5
Erla tested capacity condensers are unequaled in rigid, unvarying accuracy, so vital to success in reflex work. Eleven sizes, 35c to $1 ea.
Erla bezels greatly enhance the finest cabinet assembly. Telescoping rim, in bright nickel or dull enamel, fits any %™toM" panel. List, 20c
Dealers and Jobbers — Erla progress constantly widens avenues of trade. Write for liberal terms and discounts
For the first time, the full efficiency of vacuum tubes is completely utilized and brought under control.
In Erla reflex circuits, tubes do triple duty, providing simultaneous amplification of radio frequency, reflexed radio frequency and reflexed audio frequency currents. Yet, so precise is the manipulation of this complex current flow, that the tremendous gains resulting are achieved without a single drawback.
Not only do Erla reflex circuits demonstrate decisive superiority in range and volume, but they are alsc unequaled in selectivity,purityoftone,andeaseof control. Even the single-tube circuit provides far-flung loud speaker range, while the three-tube circuit surpasses costliest multi-stage units in transcontinental loud speaker reception. And the two-tube circuit is close behind.
Essential to the operation of these circuits, and the secret of their success, are Erla synchronizing radio and audio transformers. Providing perfect synchronization of received and reflexed currents having the same phase characteristics, they assure tremendously magnified amplification without distortion.
Complete diagrams and descriptions of perfected Erla reflex circuits are set forth in Erla Bulletin No. 14, obtainable gratis from leading radio dealers. Or write us direct, giving your dealer's name.
Electrical Research Laboratories
Dept. B 2515 Michigan Avenue, Chicago
I
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Rectified radio frequency and reflexed audio frequency currents are accurately synchronized by Erla audio transformers. List Price, $5
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Difficult, dangerou9 use of soldering irons is eliminated by Erla solderless connections, saving time, temper and money. List, 5c ea.
Providing utmost sensitive^ ness with perfect stability, the Erla fixed crystal rectifier 19 uniquely adapted for reflex work. List, $1
HE AD;iPM0Nn
CUSHION
HUDSON ROSS
123 WEST MADISON ST.
C H I C AGO
Send No
Money
GUARANTEED ONE YEAR
I //Moneubackif fneu do not satisfy after
5 DAYS TRIAL
JgEND no money! Order by postcard and pay postman on arrival. If they do not excel any other1 phones you ever used regardless of price, return them and your money will be refunded at once.
AMBASSADOR
LONG
RANGE
PHONES
! Tower Mfg. Corp.. 98 Brookline Ave.. Boston. Mass., Dep't.
-jfc Tested and approved
by Radio Broadcast