muttonchopsrule
New member
when i bought my dual rectifier, it had groove tubes EL34's in it (and still does). i plan on putting some JJ EL34's in there soon, but have no idea how i would make sure i'm getting tubes that are matched up correctly for the amp since it has the set bias. given the fact that all i know about the tubes in there now is that they're GT EL34's, would i have to get an actual reading of the bias voltage in order to get the correct tubes in the future, or is there an easy way around it?
