I also want to order another +/- pair at 17v for an old Soundcraft mixer I restored years ago. (Basically, now I am going thru things and replacing anything where I put in a Super TeddyReg, because the SPXs are so much better.) They really are astounding how much better they sound, over the standard LM devices and the STRs...I think the STRs [...] zaps life from the music, relative to the SPXs...Really amazing work, I am loving them!!!