Hi! I know this is a noob question, but I'm a little scared on doing this, i have read one can get an electric shock, so i want to be sure on how the retubing should be done on a laney irt60 head. The manual isnt specific and I havent found anything convincing on the internet. I have a tube kit for this amp, tung sol 2 6l6 and 4 12ax7. Please someone with experience on these amps and some patience to explain. Thank you in advance!