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Looks like they used a couple of adjacent parallel traces to form a capacitor to bridge the IF signal across the deleted tube...A very interesting approach!
It was not uncommon for manufacturers in the day on cheaper 'stripped down' models of sets (particularly stereo consoles) to delete sockets from PCBs and bypass signals and other electrical paths across the old socket pins....Though usually it involved soldered on wires or components, and or PCB traces strategically broken at the factory, rather than a alternate PCB foil pattern...
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