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The "lab" department has been inaugurated by RADIO BROADCAST in order that its readers may benefit from the many experiments which are necessarily carried on by the makers of this magazine in their endeavor to publish only "fact articles" backed by their personal observations.
ERRATA
The following diagrams have appeared in recent issues of RADIO BROADCAST, with slight errors in the indicated connections.
January: Page 260, Single-tube reflex plus one stage of audio: A connection should be made between the ground and negative side of the A battery.
February: Page 305, "The Best Inverse Duplex Circuit We Have Yet Seen." The telephone receivers, or loud speaker should be connected in the plate lead of the second tube, just below the connection of the .001 condenser.
February: Page 326, "The Fundamental Circuit." A connection should be made between the ground and the negative of the A battery.
THE SODION TUBE AND OUR "KNOCK-OUT' REFLEX
NO CIRCUIT ever published by RADIO BROADCAST has aroused such interest among its readers as the one-tube reflex set originally described in the November number. Stimulated by suggestions from the hundreds of readers who have written to us concerning this circuit, and by our own enthusiasm for this remarkable little set, this department has not given it up as devoid of further improvement and research. The use of the Ballantine Varioformer, in place of the homewound T2, described in the January Lab, and the reflex plus two stages of audio amplification, in our February number, are the result of our continued investigation. And now we have some more good news.
DETECTION AND REFLEX CIRCUITS
THE problem of detection in reflex circuits is one of the most serious involved in the design of such apparatus. As we have had occasion to state before, the three-element vacuum tube with its oscillating proclivities, complicates a reflex circuit to such an extent as to render this form of detection undesirable. This has left the crystal as the most satisfactory detecting medium, and the one which has been used, almost altogether, in commercial types of reflex apparatus.
The Sodion tube, however, being a stable and non-oscillating detector, will immediately suggest itself to the reflex experimenter as a detector. The R. B. Lab experienced little