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JANUARY, 1926
RADIO BROADCAST'S UNIVERSAL RECEIVER
333
FIG. 7
Here is a view of the Universal employing the new ux sockets. With this arrangement there is a generous spacing of the parts and it is possible to employ any of the ux type of tubes such as the ux-199, UX-20IA, wx-12, or ux-i 12 tubes in these sockets. The advantage of building the receiver with these sockets is apparent as there is not the necessity for using adapters when other voltage tubes are to be employed. Leads are short and direct.
another obvious advantage
DETECTOR CIRCUIT
X)02to.5Mfa
FIG. 6
This is a picture of the Universal receiver employing, in the main, General Radio Company parts. Standard uv type sockets are provided. This allows the use of either the ux or uv 201 A type of tube in this set. Note the position of the neutralizing condenser between the first two sockets at the right. The grid leak and Amperite mountings are easily accessible if replacement ever becomes necessary. The binding post terminal strip serves also as a support for the rear of the wooden subbase
R.F.Choke Coil
FIG. 9 Still another highly efficient way in which to control regeneration by a variable resistance. It is necessary to experiment with different values of capacity shunted across the resistance to obtain smooth control of regeneration. Such resistance units as the Bradleyohm No. 10, the Centralab, and the Royalty may be employed successfully
FIG. IO
With the use of the cut-out baseboard, the wiring and assembly of the parts employed in the construction of the receiver is made amazingly simple. Unlike a bakelite sub-base it is possible to screw down on to the wood the sockets, transformers, and other material without previously drilling it to admit the screws
FIG. 8
Several systems of regeneration which may be incorporated in the circuit of the Universal receiver. In A, the resistance R shunts the tickler coil which is closely coupled to the secondary. This system is employed in the receiver described. Regeneration is obtained and then controlled by varying the resistance. In B, a condenser feedback system is employed which will function remarkably well when care is taken to include in the circuit a suitable r. f. choke-coil. In C is shown the usual tickler feedback system. When General Radio coils are used in the receiver and it is desired to employ tickler feedback, a mechanical arrangement must be provided so that the tickler may be coupled to the secondary of the detector coil unit. This puts another control on the panel