the critical success factor in owning a tube amp that makes music well is working within its power envelope and matching to speakers that highlight the amp’s strengths and don’t often remind you of its weaknesses
to ask a 30-35 wpc 6l6 amp to power 86 db/w/m 6 ohm harbeth super 5’s in a large room is a recipe for a fail... but maybe a smaller room, with 8 ohm proacs or spendors? or some devores? that would be a more appropriate use case
otoh... klipsch cornwalls may be a little too easy a load...
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in a sidebar comment, now here is a honest to goodness seriously lovely tube amp...
https://www.usaudiomart.com/details/649727980-airtight-atm-1-original-version-with-tubed-rectifiers/