88db's not very efficient. Are you married to the SET topology? Have you considered triode tubes wired in PP configuration or pentode tubes wired triode mode? This might be an acceptable compromise for you if your speakers are a constraint.
Pauly; it may not be very apparent in your system due to room size, music type, etc. but, the issue is usually frequency response and bass control. You may hear some frequencies really loud but, low power doesn't really control a 10in woofer well enough to move a room full of air appropriately.
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