I have owned VTL mono 125 power amps for over 5 years and have worked perfect. I have had no problems with short tube life with tubes from VTL but now use Tesla J/J EL34's and N.O.S. Telefunken 12AT7 thes are wonderful. I use a Cardas golden power cord and the amp loves them My interconnect is also a Cardas neutral ref. I drive Alon 5 with this amp and could not be more pleased with the sound . this is a very nice amp . marc