Would someone explain to me in detail how to measure the plate voltage and cathode current with my digital meter. I know you take a reading from pin 3 to ground for the plate current, but are the power tubes in the amp or do you have to remove them? Should each of the 2 6V6 tubes show the same voltage? Be as detailed as you possibly can. This is for a '65 fender deluxe reverb reissue. I assume the speaker shoud be left connected. Thanks in advance.