Hi All
Litz wire.

To solder litz wire of the variety used by Decca.
Strip off about 10 -20 mm of the plastic/cotton covering
Dip the exposed end in paint stripper for a few minutes.
Use a tooth brush to remove the disolved enamel insulation, dip end in
white spirit and wipe.
Solder the exposed bare copper end in the usual way.
Using this method no special tools or solder pots are required.
This procedure is not required for the self fluxing litz type wire.
G3KEV