I would recommend the ASR Basis Exclusive. It is the one phono preamp I would consider to replace my phono boards in my K-1xe! (My friend uses one, so I am very familiar with it.) New they go for $7K, and used they go for about $4K, (and sometimes a little less).
Similarities to the Ayre K-1xe:
It is designed to use balanced cables as it is a fully balanced design.
It is extremely quiet.
It has lots of gain and loading options.
(And it is easier to change than the K-1xe as it is done with DIP switches, rather than swapping resisters.)
It is very musical.
*********************
Differences to the Ayre K-1xe:
It can handle two inputs, as the unit actually has two separate phono preamps in the same chasis.
It operates on batteries, rather than directly on the AC line. (It has an AC cord, which it uses to automatically recharge the on-board batteries whenever the unit senses that an LP is not playing. When the unit is playing an LP, it switches the AC off-line. Pretty cool, huh?!)
It needs a separate interconnect to connect to your preamp. (That is about the only negative thing about the unit I can say.)
As you can see by the fact that I know this unit very well that I am a big fan of the ASR Basis Exclusive!
It has been very favorably reviewed by most reviewers, including Fremer (see link below), as well as Harry Pearson with TAS who gave it a Golden Ear Award.
Stereophile Review
My two cents worth anyway.
Similarities to the Ayre K-1xe:
It is designed to use balanced cables as it is a fully balanced design.
It is extremely quiet.
It has lots of gain and loading options.
(And it is easier to change than the K-1xe as it is done with DIP switches, rather than swapping resisters.)
It is very musical.
*********************
Differences to the Ayre K-1xe:
It can handle two inputs, as the unit actually has two separate phono preamps in the same chasis.
It operates on batteries, rather than directly on the AC line. (It has an AC cord, which it uses to automatically recharge the on-board batteries whenever the unit senses that an LP is not playing. When the unit is playing an LP, it switches the AC off-line. Pretty cool, huh?!)
It needs a separate interconnect to connect to your preamp. (That is about the only negative thing about the unit I can say.)
As you can see by the fact that I know this unit very well that I am a big fan of the ASR Basis Exclusive!
It has been very favorably reviewed by most reviewers, including Fremer (see link below), as well as Harry Pearson with TAS who gave it a Golden Ear Award.
Stereophile Review
My two cents worth anyway.