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I used varnished wire when I was a teenager making rudimentary radios with ex-RAF valves, etc. If I remember right, 50 turns of that wire on a toilet roll cardboard tube was needed for the light programme or home service (what is now radios 2 and 4 from the BBC.).
I found that rubbing it with emery paper wrapped around it got the varnish off in a few seconds. That wire might be a bit thin for bus wires on a larger layout but you might get away with it on a small one like yours.
Robert
I found that rubbing it with emery paper wrapped around it got the varnish off in a few seconds. That wire might be a bit thin for bus wires on a larger layout but you might get away with it on a small one like yours.
Robert