ax7’s generally effect tonality, gain, and noise….au7’s effect body, weight, and dynamics….that according to Jim Hagerman.
I cannot argue with that generally per my experience with the Trumpet.
I've had the Trumpet twice (and sold it twice for financial reasons as expenses came up). If I ever have the financial freedom, I'll order another from Jim without a second thought. It's a beautifully transparent, revealing pre without being brittle or clinical. Conversely, it's not overly warm either. Like, @bkeske, I swapped out the tubes for the Telefunkens and Bugle Boys I preferred and they really contributed to making vinyl an immersive, beautiful experience.
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