the OTL Tenor 75Wi monoblocks are the best amps i have yet heard, integrated or not. each amp has a passive volume control. they can be used in direct mode, bypassing the volume control or integrated mode.
recently i compared a few different amps including the levinson #33, the halcro dm58, the red rose amp 1, and the atmasphere ma2 mkII.2. all great amps. i was using my levinson #32 preamp. the atmasphere was the best. the OTL design combined the best of ss and tubes. extended at both frequency extremes and pure in the mid-range. the quickest and most resolving amp i had heard.
then i tried the Tenor. WOW!!
a whole new level of clarity and musicality. the proverbial vails were lifted. if there is a better integrated than the Tenor 75Wi i would love to hear it. i compared the Tenor in integrated mode with the Tenor and the atmasphere thru the preamp. i still preferred the Tenor thru the preamp but neither compared with the Tenor in integrated mode.
if you get a chance to try the Tenor i think you will agree.