Audio Research powerful special reference GS tube amplifier using latest KT150 tubes not KT120 as ARC earlier SE versions and all latest ARC SE models like reference 160S or 160M now all start using KT150 tubes. It is significant move for ARC from KT120 to KT150 tubes if you like to play tube amplifiers, they just have huge sound stage improvement from KT120 to KT150.

Powerful tube amplifier of 155 watts per channel continuous from20Hz to 20kHz.
 
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