Haven't heard the EVO pre amp. The KCT was made specifically for the cx series.
4 responses Add your response
Bret D'Agostino, the designer son of Dan thought the Krell KRC-HR was the best Krell preamp.
The difference between the KRC and KRC-HR is the type of volume control. The KRC used either a motorized Spectrol or P&G potentiometer for level adjustment. The KRC-HR used a R2R Ladder Network volume control.
The KRC-HR in my opinion overall is the best Krell preamp ever made. The KRC-2 isn't in the same league... The original KRC is very good as well not as open and detailed as the HR.