D160 there is only 1 brand of KT120's. They are Tung Sol. So far the highs need the most taming. I sort of did that with a RCA 5751 triple mica black plate input tube and a pair of Mullard CV4024 driver/inverter tubes. Both the Rca and Mullard are very warm sounding with the Mullards being quite laid back in the highs. What I haven't tried yet is running the KT120's in 6550/KT88 mode.
What's funny I loved the KT120's for about 30 hrs when new. Then for the next 170hrs the mids became very forward and the highs somewhat harsh.
What's funny I loved the KT120's for about 30 hrs when new. Then for the next 170hrs the mids became very forward and the highs somewhat harsh.