Postby Wildone » 06 Jul 2011, 17:27
Your impedance should not change because you put in new tubes, the impedance has to do matching the ohms of your cabinet. I would read your manual and see what it has to say about the mA setting when putting in new tubes. I don't have the amp but I bet it is a setting for how hot the bias will be.
I would put in the new tubes and follow the bias procedure in the manual.
Gibson R8 - Gibson Explorer - Gibson R7 Goldtop
Marshall 2466 - Marshall JMD1 - Marshall 1987
No one wants to hear 64 bars full of 32nd-notes except the douche-bag blowing them from the stage.