I recently acquired a Thumb NT6, which is lovely in every way conceivable, but one. It has Bartolinis in it but probably not the Bartolini pre. Anyhow, the treble pot just produces hiss. It doesn't bring out the attack in the note or the string sound itself. I've read somewhere they put the frequency at 10KHz. It makes no sense to me.
So, what are your recommendations for replacing the on-board preamp? The Thumb has three pots, a stacked volume/blend, a mid, and a stacked treble/bass. Do I keep the pots and just hook them up with any 3 band preamp or do I have to buy a special kit just for this? I've heard good stuff about the Aguilar, and someone recommended a Glockenklang, which, funnily enough, state their treble frequency at 18KH(!!!). What other options are there?
Grateful for any input