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Some Predictas did use a 17DRP4 which had the 2.3 volt heater. It was advised that in order to use a 6.3v tube on an 10L43 or 11L43 chassis that a 5w resistor be bypassed -long off white box affair located on a terminal strip between the main circuit board and the IF strip.
Most often that green comes from offgassing of the plastic caused by decomposition and this interacts with the copper in the form of that green corrosion at the ends where exposed to the air. Heat quickens this process. A lot of old electronics which employ wiring with the same vinyl composition sheathing have this- as the wire is usually slimy or sticky feeling, if not mottled white and brittle, and I believe the Philco tends to suffer from the latter.
That plate cap connection is easily available. The wire attaches to a terminal strip inside the HV cage and is easily replaceable, wire and all.
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