Note: I am fully aware of the dangers in a tube amp, draining caps, etc. Please don't crowd up the thread with the ubiquitous warnings and declarations that if 'you don't already know how to do it you should take it to a qualified tech.' Not that I don't appreciate others concern for my safety. I'm trying to learn how to bias my own amps. I've researched a lot of the online sources and forums, but there's some conflicting info out there. I've seen and read about doing it with nothing more than a multimeter, but lots of guys, sources, etc. say you have to buy/build a bias probe/bias rite/etc. But I watched a Tube Depot video on YouTube where he used nothing but a mm and screwdriver to bias a Fender HR Deville. I've got a good mm, so can I just use it to do my DRRI safely?