Dear friend: If you are a music-analog/lover, then you have two directions: I understand that you like your preamp quality sound, so change your cartridge for another one that has a medium/hihg output. or second: change your preamp for a new one that will have a built-in phono stage ( no step up transformer inside ). I disagree with the people that use an outboard phono stage or stepup transformers, why? well the signal from the cartridge is a very delicate one and if you put another stages( outboard phonostage, transformers,adittional conectors and cables )always degrade this signal. In this case: " less is more ".
Go straight.
Best regards.
Raul.