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Well, there are other differences besides the PS rectifier

Obviously, 30s are mono, 240 is stereo so PS sharing is present in 240. There's also the addl feedback loop in the 240 that most likely isn't present in the 30. Hopefully since your amps are in frequent use, critical passives have been replaced, esp but not limited to the bumblebees. Unless the passives are the same for each amp, there's another possibility for sonic differences betw them. Further confounding this is the fact that Mac's unity coupled designs are inherently high feedback with nested positive and negative loops (if stock) which may diminish differences in passive characteristics. From my perspective, it's difficult to point to any one or two physical difference betw the amps as the cause of sonic differences.



Edits: 02/15/22

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