Nice write-up, Pokee. Not quite an 81 but I have 2 pairs of HF35s. 35watt mono amps. One is a Stu Remmington rebuild with chokes and fixed bias. They are glorious.
Can't speak for the HF81 but my HF35 6L6GC monos with new caps are outstanding. Lovely musicality, timbre, and delicacy and decent clean articulate bass.
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