I hate working on power amps, when I went to school for electrical equipment repair that was the one thing my instructor wouldn't go near. Some kid had brought in an old combo that wasn't getting sound, so my instructor opened it and did the "one hand in" technique and had his other arm resting on the cabinet. He reached in and got caught with the filter cap charge which went through his hand and out the elbow of the opposite arm because it was resting on one of the chassis bolts. Needless to say he had to go home for the rest of the day and kept his distance from anything with filter caps from then on, he said it felt like an elephant was sitting on his chest from the charge going through his chest and exiting out the other arm.
It was a twenty watt amp :shock:
So be careful my friend :wink: