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Show Find Substitute for Troublesome Battery Now that the Westinghouse WD11 tube Is available, many amateurs will want to substitute this tube for the six-volt tube and eliminate the troublesome trouble-some storage battery. The only difficulty diffi-culty is that sockets or adapters are not easily obtained. Since the prongs of the WD11 tube are not all the same size, nor do they have the same relative connections as the other tubes, a shown in Fig. 1, the making of a. socket Is more practicable and less difficult than an adapter, which requires the base of a burned-out burned-out tube. Take a piece of hard rubber or other Insulating material 2 Inches by 2 Inches, or the exact size of the socket you wish to replace, if you want to substitute sub-stitute In a set already made. Using the standard socket for a pattern, drill four holes for the fastening screws. Then, Instead of spring contacts for the prongs, take thin sheet copper, or, better still, phosphor bronze strips, and Fig-J fig. 2 roll three of these strips an Inch long around a 6-penny nail and one around a 20-penny spike. These tubes should fit the prongs snngly. Insert these four cylindrical tubes Into the holes drilled at the proper places as shown In Fig. 2. Solder a piece of Insulated wire to each of the tubes, under the hard rubber base and connect to proper binding post as in Fig. 2. This gives a receptacle for the WD11 tube, which can be used In a new set or which will replace any standard socket without a change In wiring. ( Radio News.) |