Most of the balanced tube pre-amps that I know of are already "top of the line" or nearly so. Changing out some capacitors will change the sound, as will changing the tubes. Changing the resistor package to Caddocks, for example, will be costly, even if you do the work yourself ($1000, or so) and will quiet the "noise floor" a bit. One that you may want to look at for not a lot of money that you can modify is the Audio Experience balanced line stage (I think they make 2 models). The BAT's, AR's, Atma-Spheres, and other balanced line stages are already "tricked out to some degree" but may benefit from noise dampening treatments, power filtration, power cords, etc. I'd recommend that you get one, see how it sounds, and then figure out specifically what you might want to change.
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