Radio Broadcast (Nov 1926-Apr 1927)

RADIO BROADCAST ADVERTISER 233 Birild Your Set With KARAS PARTS They will make it work better— look finer— last longer GL"|' the very utmost efficiency out of the radio set you build by using Karas Parts. Have it as fine in appearance as any factory-built set ever made. Build it of parts that will give years of trouble-free service. To accomplish this three-fold aim USE KARAS PARTS. No matter what circuit you use, Karas Parts will improve the results you may expect from your receiver. Thousands of enthusiastic Karas users have told us what these famous parts accomplished for them. Use these parts in your set and they will give YOU the same gratifying results. KARAS EQUAMATIC INDUCTANCE COILS A revolutionary development in the design of a scientific inductance that was perfected by Karas especially for the Equamatic System. When these coils are used with the Karas Special 17 plate Variable Condenser in the Equamatic Receiver the radio frequency tubes operate at their highest possible peak of efficiency — just below the oscillation point — because there is an absolutely constant and equal transfer of energy between the primary and secondary inductances at every wave length setting of the dials. THIS HAD NEVER BEFORE BEEN ACCOMPLISHED. No other receiver does it to-day. The Equamatic System is the only circuit in existence zvhich gives this remarkable efficiency. Karas Equamatic Inductance Coils are made of Bakelite. The 2J^ inch secondary has a slotted bracket which is mounted on the subpanel and which may be adjusted for tight or loose coupling or turned about the spring clip to give any desired rate of coupling. The 2 inch primary coil is designed to mount on the extended shaft of the Special Karas Condenser, and it too may be adjusted to the precise angle for most efficient operation. These two coils are entirely separated from each other. The Equamatic System does away with all losser methods — is wonderfully selective — has tremendous volume — and great clearness. Three Karas Equamatic Inductance Coils are packed in a box with a complete manual of simple diagrams and full instructions for building the Karas Equamatic ?-tube Sensation. Included with the coils are all necessary nuts, screws and binding posts for assembling the entire receiver. Price, set of three coils, $12.00. Karas Equamatic Retard Coils Su efficient is the Karas Equamatic Circuit that when us.ed with present-day radio tubes it becomes necessary to place a small retard coil in the grid circuit. This ijpinpact coil contains 50 turns of No. 36 wire on a % inch laminated iron core housed in a brass shield. Twu of these coils are required in the Equamatic System. Price, each, $1.00, ¥ Karas Equamatic Sub Panel Brackets These brackets make it possible to center the primary coils exactly within the secondary coils in the Equamatic Receiyer inductances, and also to have t he pivot of the adjustable primary directly above the spring clip of the secondary — two important details in the construction of the Equamatic. Three of these brackets are required. Price, set of three brackets, 70c. All Good Dealers Everywhere Handle Karas Parts We have made it possible for every radio set builder to secure Karas Parts easily and quickly. These parts have national distribution. They may be secured from all good radio dealers everywhere. However, there are times when the demand for Karas parts for popular circuits depletes some dealers' stocks, with the result that your particular dealer may be out of certain items you need. If you are in a hurry and do not wish to wait until your dealer secures a new stock from his jobber you may order direct from us, if you wish to do so. Simply fill out and mail the coupon below, telling us which parts you need, and we will send these to you by mail. SEND NO MONEY. Just hand the postman the price of the parts plus a few cents postage. KARAS HARMONIK ALL STAGE RADIO AUDIO TRANSFORMERS Every tone — every shade of tone — every vital harmonic — every overtone — is amplified with greatest volume and unvarying clearness by Karas Harmonik Audio Frequency Transformers. We designed these transformers to combine the greatest possible VOLUME with maximum clear ness. Result: When Karas Harmoniks are used there is no muffling of words or sounds — no distorted tones — just clear, pure, sweet, natural reproduction with surpassing volume. Karas Harmoniks are all stage ratio transformers. They have extremely low losses, high impedance and minimum distributed capacity. Many thousands of turns of wire finer than a human hair is wound on the large, iron core to insure high inductance and ample magnetic field for influencing the secondary windings. Karas Harmoniks have a controlled air gap which gives an extremely high amplification of low frequency fundamental harmonics. They are scientifically shielded, perfectly matched, and will outperform any other audio transformers ever made. Price, each, $7.00. KARAS MICROMETRIC VERNIER DIALS Oscillatory circuits require Karas Micrometric Vernier Dials for best results in tuning. Micrometrics tune to within i-ioooth of an inch — have 63 to 1 gear ratio — never falter or slip — have large convenient knobs which do not tire the hand — are made of Bakelite — have gold inlay precision markings — smooth, velvety action — and are absolutely free from backlash. They enable super owners to tune their sets as fine as a split hair. No other vernier dials do this. Micrometrics come in 180 and 360 degree types, are easy to attach — no panel holes to drill. Order Micometrics for your super to-day and listen to stations you never heard before. Price, $3.50 each. KARAS ORTHOMETRIC STRAIGHT FREQUENCY LINE VARIABLE CONDENSERS Called by experts the most perfect variable condensers ever produced. They possess features you will recognize as vital in condenser design. First, Karas Orthometrics have no measurable losses. Their resistance cannot even be ascertained by the most delicate instruments. As Karas dielectrics are made of hard rubber and placed well outside of the effective elctrostatic field, absorption losses are done away with. Second, Karas Orthometrics are absolutely straight frequency line condensers. The "curve" of a Karas Condenser is a perfectly straight line at every wave length setting of the dial. This result is accomplished by the scientific eccentric form and position of Karas Orthometric Rotor Plates. There is a uniform separation of all adjoining wavelengths by equal distances on the dial. Every station is equally separated from its nearest neighbor in either direction by a ten kilocycle spacing — one division of the dial. Result: NO CROWDING whatever of stations at ANY part of the broadcast waveband. Karas Orthometrics are of highest possible efficiency both electrically and mechanically. Die-stamped high quality brass frames and plates are used, both rotor and stator plates being soldered at every point of contact. Rotor plates and frame are grounded, eliminating body capacity effect. Scientific cone bearings allow rotor plates to turn easily and smoothly, yet hold the shaft firmly and in perfect alignment. Sizes and Prices 23 plate .0005 mid. capacity £7.00 17 plates .00037 mfd. capacity 6.75 Special 17 plate for Equamatic 7.00 [1 plates .00025 mfd. capacity 6.50 7 plates .00014 mfd. capacity 6.50 plates .0001 mfd. capacity 6.50 KARAS ORTHOMETRIC VARIABLE CONDENSERS KARAS ELECTRIC CO., 1061 Association Blag.. CHICAGO Please send me the following Karas Products, for which I agree to pity postman $ upon delivery, plus postage. ( ) .Set of 3 Karas Equamatic Inductance Coils, $12.00. .... Karas Audio Frequency Transformers, each, $7.00. .... Karas Orthometric Condensers, as follows: ( ) 23 plate ( ) 17 Plate ( ) Special 17 plate ( ) 11 Plate ( ) 7 Plate ( I ."> Plate .... Karas Equamatic Retard Coils, each, $1.00. .... Karas Equamatic Subpanel Brackets, set of three, 70c. Xante Address City KARAS ELECTRIC CO. 1061 Association Bldg. CHICAGO * ^ Examined and approved by Radio Broadcast (If cash accompanies order wt State will ship postpaid, I