Have ~25 hours on my VAC SigMKIIa pre upgraded to SE and hearing similar improvements described from 160i to 160iSE. Blacker background, lower noise, improved transparency, organic, timbre, musicality ... a totally different preamp and for the cost of upgrade, HIGHLY recommended!
Their were minor circuit changes removing a pair of 12au7 ... according to Kevin Hayes, major change is using statement level Lundahl signal transformers. I assume 160iSE is also using statement level transformers?
I was talking to Kevin and he said 200 IQ can also roll KT120 and KT150. He hasn't roll KT120 but KT88 beats KT150 in factory and dealer demos. I wonder if 160iSE can also roll KT120 and KT150?
Two interesting videos. 200 IQ will trip before blowing a fuse if output tube fails. Now great tube sound with SS low maintenance?
Interview with Kevin Hayes on 200 IQVAC 200 IQ in action