ARC tubes

I just re-tubed my ARC LS-15 with tubes from Upscale. They seem like nice enough people. They charge a little less than the factory. Good luck

The 6922's in your LS-16 are prone to getting noisy. Iv'e had good luck buying tubes from Audio Research, Leonard is a lot of help with problems with thier amps.Call him, see what he says about your problem .

I bought a set of Sovtek 6922 tubes from ARC two months ago and although they are reasonably decent, my ARC LS16 still doesn't sound as good as I would like. As more experienced tube users have suggested, my next step will be to try some NOS tubes, probably from Kevin Deal at http://upscaleaudio.com. If I'm still not satisfied, I'll sell the LS16 and not use a preamp at all!