[ducretet]

Yes, I have seen the discussion. But, the problem is not in the volts. We all know that a high voltage passes through the three speaker wires (anode, screen grid). The problem of the thickness in a cable depends on the amperage that circulates through it. The amperage is not too high, so the cable does not have to be too thick.
The problem is finding cables that look aesthetically like the originals. And that is difficult .... !!!