Tube Amp Archive

I was cleaning the tube sockets working on the crackle problem. Put the GT whites back in and turned on the amp. Spark came out of R61. Blew a hole in it! Planning on fixing R61 and replacing the power tubes as one was running very hot.

HRD had crackle and pop while on. Pulled the back. Changing tubes and had a spark from R61. Need to replace this one first. Spec says 1watt, 470 ohms. Question is is this a metal foil or carbon type? Best place to find replacement?