I recently installed a switch on my silverface Princeton Reverb to switch between a tube rectifier and diode rectifier (I also included an extra filtering cap on the diode rectifier). I want to ensure it's running safely, and not overtaxing the power transformer (or causing any other issue). Two questions: 1. What is the safe current draw limit of the transformer? How can I find this out? 2. How can I measure the current running through the transformer? I'm unsure where I'd hook up my multimeter to measure this. Random thought, I could maybe take out the fuse from the amp, and attach the ammeter leads to the fuse terminals? I think I'd have to measure AC current if I did this.