The EL84 does produce a very smooth, warm sound. Not as defined or extended on lows, not as detailed on highs. Midrange is excellent, I like it better than the EL34 in this regard. A classic tubey sound.
I presently own two EL84 amps, and had several in the past. I still remember how nice an Eico HF81 sounded.
All in all, it's my favorite tube. Although I do love my 6CA7 running in triode mode.
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