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As a newbie, I decided to try a tube amplifier. So I obtained Antique
Sound Labs Wave AV-8 monoblocks (8 wpc push-pull) and hooked them up
to my Klipsch Synergy F-2 (95.5 dB sensitivity; 8 ohm impedance)
speakers. After just a couple of hours I had a vicious headache and
burning/ringing in my ears.

I wasn't playing loud at all - just normal listening levels. I
couldn't have been anywhere near max output of amp.

I've never experienced this before with my SS integrated amp. It's
rated at 27 wpc and it's described as a "BTL (Bridge-Tied Load)-
connected SEPP (Single Ended Push Pull) circuit."

Anyone know what could have caused this and how to fix?

Maybe my ears don't like push-pull tube amps? Would a SET be better?