I apologise if this is the wrong thread to ask (there are a lot of threads!), but I am relatively new to audiophile-land. I've had a Mk II for about a year now, as well as the HD595s, and have loved every moment of music. I was wondering if anyone could suggest any tubes to replace the stock tubes that come with it that might give it a warmer sound? Or, indeed, if it's worth changing them at all?
I am 'umming' and 'arring' about getting some HD650s, and was hoping to upgrade my current amp in anyway possible, as I can't really afford a new amp on top of that. (I wish I had originally gone for the Mk III, even if just for the look of the thing - but I'm still happy with my Mk II as it is my first tube amp!)