[radio1]

The early sets used grid hookup 11 strand 'impregnated' wires (green cloth) with (it seems) an inner wrap of cloth under the outer. Do these offer any sort of shielding?  Has anyone ever noticed a big difference when using a newer plastic coated stranded wire, aluminum - Chinese or whatever? Curious of others experience. I read in a old radio service publication which said that a shielded grid wire with one end grounded would certainly help on some radios. Not really sure what the Philco catalogs (looking at '37 parts catalog) mean by 'impregnated'.