Amp suggestions for Audio Research LS-16

I am not suggesting the D-115 Mk2 over the VT-100 Mk2 which I have also heard and is excellent and I am sure better overall than the D-115 though I can't say since I haven't heard them both in the same system. I am just suggesting the D-115 Mk2 as a less expensive alternative. The power storage on the VT-100 Mk2 is much greater so dynamics and noise floor should be a big improvement overall.

Tubegroover- How often do you need to replace the tubes in the D-115 Mk2? I was considering the VT-100 MkII, but was concerned with how often the tubes need replacing. Also how hot does the unit get? Thanks for all your suggestions.

In the VT series of Audio Research amps, they recommend to change tubes every 2000 hours. I listen to my system about 20 hours a week, and I saw tube life at about 2.5 years on my first set (more than 2000 hours). My second set is not near ready to be changed with over 1 year of use. As far as heat goes -- any 100W per channel tube amp is going to make some heat. My amp has 12 inches of space above it in an open rack and it is fine. The thing that hooked me on all of the ARC products I have owned are the reliability, audio performance, and factory support. ARC has any part for any piece of gear they have ever made -- and in the audiophile industry, there is only a handfull of manufacturers that can say that.

The D-115 runs very hot. I have the metal cover off to help dissapate the heat which helps keep the tubes cooler. I can't say how frequently the tubes need to be changed because I have only had the amp about 4 months. When shipped to me 2 of the output and 1 regulator tube broke (Gold Aero). I replaced with Svetlana 6550's at just South of 200.00 (from Triode Electonics 6 month warranty on tubes). I expect based on my conversations with other owners that tube life is about 2000-2500 hours maybe more if you keep the amp in a very well ventilated location and KEEP THE COVER OFF! Good luck.

Thanks for all your help. I came across a Plinius SA100 MkIII and decided to give it a try. Should be a good combination.