Rubber covered with a fabric perhaps nylon though earlier fabric covered wires also may have used asbestos cloth.
Multi strand tinned copper wire.
Never use solder that contains acid which can damage the wire or its insulation.
The best solder to use for tinning stranded copper wire is electrical grade rosin core solder.
Acid core solder is intended for use in plumbing applications.
This is an acid free solder that contains a flux in the core of the solder.
Tinned copper multistrand wire in a black cotton and oil dielectricum among enthusiasts recognised as the go to wire for real sound.
You will note the two layers of insulation.
Tinned copper multi strand 12 copper wire used in wiring a fluorescent light ballast in a minnesota home constructed in the 1960 s.
Tinned wire is more expensive than its non tinned counterpart but it lasts significantly longer and is easier.
This wire has been much anticipated and is already receiving very good reviews.
To read the positive feedback review of the new duelund wire please click here.
Multi conductor cable is available in 14 16 18 20 22 and 24 awg in a wide variety of configurations and features annealed stranded tinned copper wire all of which is rohs ul and csa compliant.