I used heavy guage 9' lenghts of Belden and frankly couldn't hear enuf, if any difference, between these and more costly stuff which would justify the cost. Try some, should cost less that $30 for a pair. At least you will have a bench mark for listening to the differences subsequent cables might bring. Spend the money you save on tubes. Changing out the drivers and power tubes in the amp, it can make big difference in the sound. :-)