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My Rebel 30 head will not allow me to bias the 6v6 tubes past 30mA. The EL84 bias to 40mA just fine. Anybody any idea what the problem could be? I depend on this amp.

So I bought this used Rebel 30 head. The OD channel sounded all fuzzy, so I retubed it. I successfully set the EL84s to 40mA; however, I run out of pot trying to bias the 6V6s. I get up to 28mA and the pot is maxed out. I think to myself, something wrong with the new tubes. So I put the...