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It really is the same question

None of their designs have ever supported the higher bias current of the KT-120. You can't just drop it into any amp. Bea Lamm does not recommend such a swap and Luke is more specific as to why they haven't adjusted the circuitry in order to do so:

"The primary reason we don't use the KT120 is that we don't find their sound to meet our sonic requirements, with a grainy, forward sound, akin to that of the 6DJ8/6922 series of tubes. The KT120 seems to us to homogenize the sound, such that nuances and fine inner details get masked. There is a suppleness in the sound of the 6550/KT88 that seems to be lacking in the KT120."

Audio Beat review of MB-450


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