IvesH , so far is good , the power output a bit too low for KT88 . More advices if you share the schematic .
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Haven't seen it mentioned yet, but all high performance amplifiers need a Zobel across their loudspeaker outputs. Values aren't critical - 10R and 0.1uF in series across 8 Ohms in always fine - but necessary.
YOS,
Chris
YOS,
Chris