10-04-2013, 01:19 PM
The wire should be nichrome resistance wire - stating the obvious, but don't use ordinary magnet wire...
If possible and you are up for a repair like that, I'd remove the wax coating in some organic solvent (meths/white spirit/propan2ol etc.) and remove the failed windings cleanly.
Measure diameter of removed wire and using an exact-ish replacement (sure that 10% or so variation shouldn't matter), splice the new wire in and rewind failed number of turns.
If the replacement wire is not insulated, coat it a couple of times with FEV (French Enamel Varnish - available from "craft shops"), do the wrap, then very lightly sand the top to allow a conductive surface for the wiper. re-dip in wax should you want that "authentic" look
I did this some years back on an old US-made tube tester - it worked well...
If possible and you are up for a repair like that, I'd remove the wax coating in some organic solvent (meths/white spirit/propan2ol etc.) and remove the failed windings cleanly.
Measure diameter of removed wire and using an exact-ish replacement (sure that 10% or so variation shouldn't matter), splice the new wire in and rewind failed number of turns.
If the replacement wire is not insulated, coat it a couple of times with FEV (French Enamel Varnish - available from "craft shops"), do the wrap, then very lightly sand the top to allow a conductive surface for the wiper. re-dip in wax should you want that "authentic" look
I did this some years back on an old US-made tube tester - it worked well...
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