Upgrade to Eastern MINIMAX Pre

Am using a very nice sounding MINI MAX Preamp in my tube based system. Sounds good enough to leave alone. Whats the next step up still decent Non Morgtage price?
Thanks there
What do you want to achieve. I think you need to provide more info for real answer. Clean and pure, convenient , new, passive, lots of gain, phono?
Full extention without harshness clear mids not overdone.
Eastern compares to audible illusions m3a(current), audio research Ls15, ls2BII, which ive owned. Phono and passive no need for. Thanks for the reply