We are glad to introduce a new mono block set with matching preamp. 60 watts RMS each mono block using 6550 tube in UL connection. May be wired to Triode operation with output of 30 watts RMS each mono block. It has built in bias meter so re-biasing is quick and simple. It can take other types of tubes like KT88, KT77 etc. Preamp stage uses 6n1P NOS Russian Military Grade, tube rectified, fitted with ALPS Remote controlled motorized potentiometer and relay operation source selector.