Butler Audio aka Tube Drivers are very nice hybrid amplifiers designed by Mr. B.K. Butler who has a lot of experience in designing professional amps and gears for renowned music artists.
The preamp section is Tube (not fully) but the power section is mosfet based.
The Tube drivers are good for mids and tweets but not that great for lower midbass and bass applications. They are not cheap amps and one can buy much better amplifiers for the same price. Surely one of the few strong contenders for true SQ application.
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