Who is the best power amplifier that matches better with Zellaton plural evo

If you are spending Nagra money the KRELL KSA i400 would be what I would look at. I have owned 2 of the lower end models and they sounded great. Super smooth and buttery sound with good detail. Class A using the KRELL iBias system. It also runs cool.

Th KSA i400 is much better than what I owned (K-300i and Duo 175XD) and can drive any speaker.

Krell Illusion II/KSA-i400 Pre/Power Amplifiers | Hi-Fi News (hifinews.com)

This review is not that great.

Krell KSA-i400 40th-Anniversary Reference Stereo Power Amplifier | Hi-Fi Heaven (hifiheaven.net)

I would use a Benchmark LA4 preamp with the KSA i400 if I ever got it.

BTW - I should state that I have not heard the KSA i400 yet. I am afraid to hear it :)

Convergent Audio Technology (CAT) have superb sound and can drive anything.  They have no problem with MBL or Magico.  

I have a Classic and use it to drive my ProAc D-40r speakers.

Get another Classic and use them as mono blocks.

I have a friend who does that with Wilson Benesch Resolution speakers.

He also has the Classic Preamp. Great sound.