Will preamp manufacturers tell you if the model is phase inverse?

Virtually certain that the RP-1 inverts phase--confirm with John Rutan (audioconnection on this board).  I think the added complication with that preamp is that the phono pre-amp adds another stage of inversion, bringing you back into phase.  If you care about that sort of thing (I do, others don't), it means you're switching speaker wires around when you play records....

it means you’re switching speaker wires around when you play records....

Or you could just invert the phono leads at the arm/cartridge and be done. I once owned a preamp that only inverted the phono stage, the line stage was normal.

Ah, yes!  Good point.

Virtually certain that the RP-1 inverts phase--confirm with John Rutan (audioconnection on this board).  I think the added complication with that preamp is that the phono pre-amp adds another stage of inversion, bringing you back into phase.  If you care about that sort of thing (I do, others don't), it means you're switching speaker wires around when you play records....

Looks like a lot of maintenance to play records. One would think they would at least include a switch. I have heard that some amps do include a phase switch. Not certain for the phono section. I'll reach out to Rogue and get back

I just heard back from Nick at Rogue. The RP-1 and the RP-5 Both invert phase on ALL inputs (including phono). So I would need to switch speaker terminals when using. I wonder how many owners are not switching the terminals