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What about the tubes themselves used in each which tubes are better or more efficient ect and why?



Example:  572 vs 3CX800A7 vs 3-500ZG ect

Even though the al-80b seems to be best bang for the buck a few hundred more for a 2 tube 3-500zg amp vs 572 tuned amp vs a 3CX800A7 tubed amp?



Pro and cons of tubs used in general.