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Thank you for the opinion. I have come to the same conclusion, especially after reading Kevin Deal saying that make of the last 6550 tubes made were not as good as the earlier ones
My speakers are SoubdLab Dynastat, about as big as this room can handle, and I am very fond of their sound using another amp with 12 6L6GC Sylvania tubes and M8137 drivers.
The VTL MB450 I bought to help a friend in a Divorce, so I will give the beast a try.with the KT88s