Ugh. Well thanks for confirming. I think I'll swap them out but keep the Sophia in and see how that combo sounds. I might be outside the return period; I'll have to check.
I stay away from Woo's "upgrade tube options" due to the fact that they definitely didn't sound "upgraded" to me. The only thing "upgraded" was their prices. I did "upgrade" (like most) to the SP-274B only to find the Brimar 5Z4G out performed it at a fraction of the price.