I just bought an old silverface Fender Musicmaster bass amp with two 6V6 tubes. The tubes don't seem to have a notch which makes them plug in only one way. I can rotate them and plug them in in many directions. -- My victoria amp with a 6L6 has a notch so it is lined up properly when it's put in place. will the 6V6 pair work fine any way they are plugged in?