I am a big fan of the Butler products. A 5150 would be a great way to inject tube sound into a HT system, without the heat and hassle of so many channels of tube sound.
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Have not heard the Lexicon amp so cannot compare, but the Butler TDB 5150 has been an excellent addition to my HT system and has performed flawlessly for about 6-7 years now.
It's not super +tubey" sounding; I'd describe it as somewhere in between a classic push-pull tube amp (with some negative feedback) and a warm SS amp overall.