will
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This is just an observation, as I do not know the details electronically. But I think that with the big VRs, the general signature remains relatively similar with the different lettered/voltages of A,B,C,D.
In you case, as you change them, since your start is the lowest key one....as the grid voltage increases, the sound of the tubes downstream of the VRs becomes more.....sort of across the spectrum, but particularly notable is weight, body and bass. I think this is why Steve talks about using them to tune the bass in particular.
In my case, with various editions of my room/system, I used VRs to tone down the VRs from the stock OA3 to OB3 or OC3W, resulting in a slightly lower key presentation overall, less weight/bass, and a resulting sense of more midrange openness.
Lately I use either the OB3 or OA3, and for me when I don't want to use the OA3s, it is because, in that set, they tend to be a little in my face....good stuff but a little pushy. My system/room/tastes though. I'll be interested to hear yours.
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