Very easy. The M-120's are auto biasing. The M-150's are manual but, very easy.
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Thanks for the responses. I was hoping you were going to say they were auto biasing. Funny, from my google search, none of what I could find indicated they were self biasing. What can you expect going from the 120s to the Magnum 120s and then to the 150s? What is a good price range for these assuming stock tubes? I know what the blue book says, but... :).