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For the lowest noise and extended frequency response, for a tweeter amp I would go low power (10-20w) Class A solid state.
Perhaps seeing you can diy, I would look at one of Nelson Pass small class A’s First Watt type in kit form, many clones on ebay..
I built this little 20watter classA back in the 70's measured ultra stable and flat to 150khz driving just the 4x treble panels of double stacked Quad 57's with a Decca Kelly ribbon passively cross at 10khz magnificent extended highs, (no tube could match it).
The best amp I have ever heard is First Watt SIT-1 which a friend of mine wanted to hear with my speakers. They were not powerful enough for my speakers, but it sounded much much better than any other amps that I heard with my B&W 800d. Since then, I start wishing my speakers would be more efficient...
It is a class A amp.