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 ble to the grid terminal of the tube socket to which it is to be fastened. It will also be noted that, in many cases where a lead should go through the subpanel, a special hole has not been drilled, but the lug has been joined to a soldering lug placed under a near-by mounting screw and the circuit picked up from the screw under the subpanel, thereby simplifying the operation.

The underside view of the subpanel, shown on this page, gives the method of wiring and the location of all the fixed condensers except the .00025 grid condenser, which is mounted directly on the socket terminal above the subpanel. This photo shows another detail, which should be mounted at this time—the bar which is mounted across the brackets at the rear as a supporting beam for the subpanel. It consists of a strip of panel material. $3/16$ by 1$1/8$ by 23 in., and is fastened to the rear ends of the subpanel brackets by means of four short machine screws. This bar increases the rigidity of the assembly, thus assuring the continued per-