I got the yoke off now (it just needed a little twist once the screws were loosened to break the grip of the glue). The only thing I need to get off now is the metal band around the front of the tube that the screws go through to bolt the tube to the front of the case. It looks like there a clamp that slides back but what's a good tool to use for this? So far I've managed to not have this thing explode in my face or electrocute me and I want to keep being safe about this.

Another question, I have a Plus that stopped working a while ago. Is the tube the same in that model as the one in the SE? Does it matter if it's not?