If you read my review of the Wywires loom in the March 2012 issue of HiFi'Zine you'll know that I've been impressed with the addition of Spectron's Thunderbolt cords on my power amps. In fact, I was so impressed, I bought a couple as I'd never heard a power cord do for an amp what these cords did to my Musician Mk III monos. Intending to give these more coverage as time went on, I was surprised to learn tonight that Spectron are no longer going to sell them. Apparently production costs have risen through the roof and they don't think they can sell these profitably any more. What a shame -- these were not cheap, with the Mk2 listing at close to $2500 per cord, but still they can't make sufficient profit to justify continuation. I have no idea what went into these cables, and I do know metal prices have gone through the roof, but the Thunderbolt Mk 2s remain for me the best power cords I ever heard on my monoblocks, and by no small margin.