i am a lover of the LS3/5a, having purchased original rogers in the mid 70s and held them for 25 years until college funding caused me to liquidated everything. i had owned many amps over that tiem period, and (due to their small size) brought the speakers into many audio salons to listen to still more electronics. if you are like me, it is about the midrange and the great soundstage.
i have found that el34 tube amps are the best match for the ls3/5a. they bring out the best of its characteristics. i had settled into the conrad johnson el34 amps, which gave them the most warmth. however, i have not listened to CJ current versions.
when i got back into audio a few years ago after my kids were all gone, i wnet with proac mini monitors instead of the ls3/5a. not sure if it was the right decision, but, here i am. the amp i fell in love with is the primaluna dialogue premium. i have the hp (high power) version which runs 4 el34s per channel in stereo mode. the amp can be used as a mono block, giving a good step up oportunity in the future. while this model is the best of the primaluna amps and costs $3500 new, their prologue series are less expensive and can be found used, especially if you want their integrated amp versions.
you might consider the integrated primaluna as, especailly with the ls3/5a, the tube preamp will be a big improvemtn over almost all passive preamps, based upon my past experience.
good luck. as someone who was out of audio for a while, it is great to be backmlistening again! enjoy!
