should I stay with Audio Research LS25 ?

Is your LS25 a MKI or MKII version. I currently own the MKI (with NOS 6H23 6922 tubes) which I prefer to the MKII version with its FET/6H30 hybrid confguration.

In any event, I would keep the LS25.

Thanks for the input.
First off it is the MK1 version. As for tubes, I am new to this game and find it a bit confusing as to what dose what.At present they are GE electric 6DJ8 in the back and Russian 6922 in the front.
My thought about going with a Rogue pre-amp was for synergy and possibly a quieter background. I've noticed when running the amps dirrect from my cd player that they are almost dead quiet compared with having the pre-amp in line.

Kabir:

With the 6H23 NOS 6922 tubes, my system is dead quiet with the LS25 volume at the maximum setting for CD playback. With my Phono playback there is a very slight hiss with the volume setting at the maximum. For replacement tubes you may want to contact Upscale Audio and talk to Kevin Deal.