[Arran]

Where I am there could be a use for the wave trap, there are a few beacons operating on longwave, I assume they are part of the LORAN system, or are related to a nearby airbase. There is one where you can sometimes hear a harmonic in the background of a station at 1040 Kc, though once that station was bought out and switched to a sports-gossip station I stopped listening to it, apparently it's a comedy station now. Anyhow reconstruting the choke is fairly easy, some sets used a proper coil form slipped over the cap, but with others they just wound some 18 or 20 gauge wire around the cardboard shell of the cap ten times, and called it done.
Regards
Arran