It is true Teflon in particular needs a longer burn in time that other insulation materials. There may be some other materials which also need exceptionally long periods..
Another problem may be the strength of the signal... A phono cartridge is a tiny signal. and could take near forever to break in a cable! (One place to make sure you have a cable which sounds good right out of the box IMO)
Another problem may be the strength of the signal... A phono cartridge is a tiny signal. and could take near forever to break in a cable! (One place to make sure you have a cable which sounds good right out of the box IMO)