I have the LS-25 mkII and have swapped tubes many times without any problems. As Mofimadness stated, preamp tubes don't need to be biased.
ARC LS25 mkII adjustment
Does anyone know the procedure to adjust the LS25 mkII preamp? I am considering swapping tubes with new ones and would like to know how to adjust the 2 trimmers that looks like sets the voltage for the tube bias.
I don't have any documentation on where to measure and what to set to. Anyone have any experience with this preamp?
I don't have any documentation on where to measure and what to set to. Anyone have any experience with this preamp?