This has probably been covered here before, but... My Allen Accomplice Jr. currently has a 5AR4 rectifier and RCA 6V6GTA power tubes in it. I want to see how different rectifiers affect plate voltage, cathode current and sound, but don’t want to do anything to damage the amp. (Duh!) I found this site with a lot of specs on various rectifier tubes: http://www.fourwater.com/files/fullrect.txt Admittedly I do not know what a lot of these numbers mean, except that using a rectifier that draws a higher filament current could cause transformer damage, so I was looking at tubes with ~2-amp current. Here are the specs of the tubes I was looking at: Here is what the current setup looks like. The first plate voltage is with maximum negative bias voltage applied. The rest of the numbers are after the bias voltage was set and is pretty self explanatory. So here’s the question: Considering the specs on the 5R4 and 5V4 and 5Y3 rectifiers, how will the numbers I am seeing in my amp change using each of them and how might it affect the sound?