I did because of the unpredictability of the 6N30Ps not anymore with the Sovteks being in abundant supply now. Prefer the DR tubes sonically a bit more than the Sovteks but the latter seems to be more stable why I'm not worried to leave the ML3 on with them installed.
david
What is the difference between the Sovtek and the ELectro-Harmonix 6N30? Are they manufactured in the same factory?