hey yall, I just got a 69 drip edge super in a trade. I love it. I thought it was AB763 but a look under the hood has shown me otherwise. It looks like the bias was set back to 763 though. It sounds great! My question is about the 5u4gb in it. I’m wondering if it would raise headroom if I switched it back to a gz34 (in theory)??Looking to raise my clean threshold. I’d have my tech swap it to make sure the tube agrees with everything in the amp.