N-set, a friend of mine built an amp with this monstrous USSR tube. It has 3 stages and the GU81M is driven by 6C33C. Within context of driving mid or high sensitivity bass drivers, this is all you need. In comparison, his previous SET with 6C33C sounds like a toy. There is only one tube that can beat GU81M in terms of dynamics and effortlessness in the bass octaves and it is GM100. |
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