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RADIO BROADCAST ADVERTISER
147
Coils for Roberts Circuit >o. Price $8.00 a set
An entirely Tieiv systerii of Radio Reception
Die*
i eave Lous have oeen specified for use in the Eoyt System of Signal Augmentation, by the inrenior, Franc-is R. Eoyt. We hate a limited number of blue printed copies of Mr. Hoyt's original laboratory notes on this new system of radio reception, together icith nine circuit sketches, which will be sent free to you upon receipt of this coupon and four cents for postage.
The F. W. Sickles Co.
335 Wortbington St.. Springfield. Mass.
Please send information of Hovt System.
Name . . Address
SICKLES
DIAMOND-WEAVE COILS
Patented Aug. 21. 1923
For Craig. Roberts and Hovt Circuits
Sickles Coils were chosen by Albert G. Craig in designing his remarkable new Reflex Receiver using the new Sodion detector, and are specified by him for this circuit in the February issue of Popular Radio. This coil set. No. 20. is priced at 84.50.
For the very popular Roberts Circuit the Sickles Coil Set Xo. 18 (88.00) is standard equipment. Unit Xo. 1 has primary and secondary coils. Unit Xo. -2 has primary, secondary, neutralizing coil and tickler. Broad variation in coupling adjustments is provided for. Tickler is provided with ISO degree dial control.
Coils for the Hoyt Circuit at 810.00 a set, for the Knockout Reflex Circuit at 84.00 a pair, the Tuned Radio Frequency coil at 8-2.00 each and the Acme Reflex circuit at 84.50 a set are among the standard Sickles coils. We manufacture special coils also for manufacturers' requirements.
Send for descriptive catalogue
* The F. W. Sickles Co.
335 Wortkington Street SPRINGFIELD. MASS.
RADIO
WHOLESALE RADIO SERVICE CO
9 CHURCH STREET — NEW YORK
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Xo other catalog includes such a complete assortment of KNOCKDOWN Sets and Circuits.
Cockaday Super-Het, Ultradyne, Cockaday DX, Roberts KnockOut, Neutrodyne, Superdyne, Pressley Super-Het, Rasla,
and many others. A complete list of over 800 Broadcasting stations, trouble shooting chart and much matter of general interest to every radio fan is included.
We specialize in Radio Broadcast Circuits
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WHOLESALE RADIO SERVICE CO., 9 Church St., New York City
it Tested and approved by Radio Broadcast ^