I have never heard the non magnum version of the 120's but the difference between the 120 mag and the 150's is big. 150's are quieter and sound effortless compared to the 120's.
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... :).
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