Radio broadcast .. (1922-30)

Record Details:

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The Super-Autodyne 381 core solder and non-corrosive paste, i side-cutting pliers, i screw-driver, hammer, and centerpunch. THE OSCILLATOR COUPLER AND GENERAL ASSEMBLY THE oscillator coupler may be made by winding two sections separated TVinch apart on a 2|-inch bakelite or condensite tube; each section containing twenty-eight turns of No. 28 d.s.c. wire. The rotor coil also consists of twenty-eight turns of the same size wire on a i|-inch tube rotatable within the stator tube. As soon as the materials have been procured, each item should be carefully examined to see that all screws and nuts are tight, and lugs placed as shown in the photographs, so that those on the various instruments will point in the best directions for short leads. Socket springs should be bent up to make good contact with tube pins. Condenser bearings should be adjusted to give the desired tension. If the builder already has Benjamin sockets, the socket-shelf may be made up by drilling a piece of bakelite 17! x 4! x \ inch in accordance with Fig. 7. The bases should be removed from the Benjamin sockets so that they may be fastened directly to the sub-base with their original screws. On each terminal will be found a round knurled nut, a hexagonal nut, and a round-headed screw. The screw should be put through the hole in the spring, pointing downward. The knurled nut is turned up on the screw under the spring, the screw pushed through its hole in the shelf, a lug placed over it if necessary, and the "hex" nut tightened up on the under side of the shelf. Care should be taken to prevent the spring from twisting as the nut is tightened, due to rotation of the screw. If this occurs, the socket will not ride evenly on its spring. Details of these operations may be obtained from Figs. 2, 3, and 4. Either uv-i9Q or standard uv-2oiA sockets may be used. They should be arranged so that their grid terminals come out at the left rear, as in Fig. 3. The front panel may be laid out in accordance with Fig. 8, using a rule and scriber after which the hole locations should be punched with a center-punch or nail, and a hammer. After drilling the holes, the panel may be grained with fine sand-paper and oil, rubbing in one direction until the original polished finish has disappeared. After wiping the panel off with alcohol, indicating marks for the dials may be scratched as in Fig. i, and filled with Chinese white. The sub panel should not be grained. FIG. 7 Drilling dimensions for the sub-panel