Not strictly Amp Tech material but I thought I would get a more pertinent response here. I got an old Tel-Ray/Fender Echo Reverb unit. Thing sounds great, if a little noisy at the moment. Anyway I've got it open and I've been playing it, replacing some parts etc. Earlier I had it on and I touched the outside of the cap can and received a little shock. Felt like AC, if I had to guess. Had that pulsing feel. Moving along, I decided it might be a good time to take a peek at the power supply circuit, for obvious reasons. Measuring to chassis I've got Open Loop from both prongs of the power plug and from both sides of the primary. Any ideas on this one? Also what the heck is that 0.047µF cap on the hot of the primary all about? Is this a 'death cap', but without the ground switch? Whats it for? Cleaning up dirty power? Should I remove it? I am definitely going to put a 3-prong cord on this joker. Any advice is greatly appreciated.