I owned the ARC D115 MkII for 12 years (1988-2000). It performed flawlessy. I experienced some tube arching problems some yaears ago when I tried the Chineese 6550. Since replacing the Chineese 6550 with the Sevetlana tubes, the amp was trouble free. I loved the D115 MkII. It is a great amp. Highly recommended.
The D125 is a Hybrid. It has better control in the bass and mid-bass. However, I prefer the midrange of the D115 (sweeter, more liquid). However, either amp would be very satisfying.
PS: I upgraded to the ARC VT100 MKII.
The D125 is a Hybrid. It has better control in the bass and mid-bass. However, I prefer the midrange of the D115 (sweeter, more liquid). However, either amp would be very satisfying.
PS: I upgraded to the ARC VT100 MKII.