Hello Friends. I'm using my POD HD500 connected to a stereo power amp (clone of the power of a Randall Century 200), with a 4 x 12 cabs with Celestion speakers seventy/80. This stereo power amp "Colours" signal much as it produces a very sharp and scoop sound. What power amp do you recommend to use with POD HD500? Valves or solid state?? What brands and models? I'm a guitarist in a band of modern metal. Thank you very much from now. Pdt. Excuse my English