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At Ziggies last night Dan compared two amps: My 1953 Masco ME-18 and his Sonny Junior 410 amp. It is an interesting study in contrasting tones.
The SJ amp sounds like a lot of Bassman-type amps: Smooth and strong; not a lot of crunch. The Masco, because of it's more primitive cathode biased circuit, crunches happily along. At 20 watts it does not get the big thump of the 410 but it sure gets more color.
For you guys who love tube amp distortion (like I do) this is about as good as it gets.