Someone gave me a basket case 101 awhile back that I put back on the bench and I ran into a strange problem. The notes he gave me when I first got it was that it had weak output on 20 meters and below, even with new tubes. Just in case, I put some toshibas in that I know are good and tuned up into a dummy load and saw that it indeed had low output on 20 meters (maybe around 20 watts max) but it was also low on 80 and 40 (around 40 watts). My first thought was I should neutralize the finals because I need practice doing that anyway and in the service manual it says to put it on 10 meters (10C) @29mhz. After moving the dial to 29mhz, I decided to turn on the internal calibrater to make sure I was exactly on frequency. When the tone began to be received the audio began to crackle and I saw arcing taking place in the final section. I immediately powered off the rig. I’m not sure where to go from here. The service manual doesn’t seem to describe anything like this. I’m not even sure why the finals would be doing anything at all when I wasn’t keying anything up. I do have the riser boards so I was thinking maybe I just leave the heater switched off and just start going through and checking voltages. One possible culprit on the fault tree for low power out is PB1180 high frequency IF unit - maybe there is a short?