If you have the vk-150, NOT the vk150se, then the front 6sn7's are VERY critical-they are the input tubes. I'd spend the most you can there. So 4 tubes in your case. Then, replace the other 12. Worked wonders in my old vk60. I've since replaced it with a vk75se. Call BAT as well, they'll have some good advice.
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