Tube Basics 101: What is a rectifier tube for?

Hi, Phillip , thanks for your response , my amp its totally new , unhappy with the Capacitors it came with i bought the best brand i could find , "Jensen" i changed three of them , , the amp its beautifully made Point to point and is starting to sound much to my liking , i just changed the RCA  5R4WGB rectifier with another one , can't tell which brand is it as the lettering its almost gone , BUT it made a difference in sound , i think both channels play more balanced , your are right about the potentiometer , it does play unbalanced at lower volume , which indicates that the issue is the potentiometer . fortunately i have one made especially for AN , by Audio Note , thanks again !!!

I have question , will a rectifier tube affect the volume ? The left channel of my tube amp sounds a bit louder than the right channel , i was hoping that a rectifier could even out the sound in both channels , i have swap  the 6SN7, as well as the 2A3 tubes , the result is the same , any thoughts ? , i have bought a new and expensive volume potentiometer (100 K)to replace the one it has (50 K ),  will solve this issue ? , many thanks !!!