Forum poulace,I am considering adding a class A or A/B tube buffer between my Denon 2930 ci and my Denon AVR 5600.Investment ceiling to achieve this goal is 1200.00 U.S..What I am seeking is a front to back schematic and/or diy kit to construct an integrated tube buffer.T the buffer/buffers should have o dB gain,thd of less than .05,capability of impedence matching,broad bandwith,and a signal coloration that is neither clinical nor muddy.I would like suggestions that are based on the experience and knowledgable.Thanks,K.C.