Question: Since the 7025 is a silent 12AX7 is there any reason not to just use 7025 instead ? Have a few that I saved from 1970 when I was on the road switching tubes every couple of years...still test and sound great. RCA, Telefunken, other Russian & Japanese brands. Why does my twin reverb use both of those tubes in different places if they are the same thing? I can't hear any difference --- is that my ears ?