SB3 has DC blocking caps of course, but it does not have resistors to keep the output at 0V if there's no load. The vast majority of preamps have some input resistance which does this. This subject has come up before, and I forget the details but somehow we ended up with the conclusion that not having those resistors on the output device was standard practice and considered OK. But in this case, what's probably happening is that there is no load at all on SB3's outputs and this is causing them to drift up to its op-amp's bias of ~4V.
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