HARBETH: Amp for 7ES Compact – F5 or an alternative class A amp be suitable?

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I have a pair of Harbeth 7ES compacts. I'm driving them with a Marantz PM17 at the moment. I'm considering building an amp. Would something like a Nelson Pass F5 25W per channel be sufficient ? I see there are a whole community of F5 and similar amp builders out there, or would a powerful AB, say 150W plus be more suitable?

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