will
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I think the fuse board presence is probably more about newer versus older amps. I recall seeing a pic of a Torii IV with rectifier fuse boards. But my Toriis, being older, do not have them, the IEC fuse breaking when a rectifier shorts.
I would assume similarly to CAJames, since IEC fuses can be heard, it would seem the rectifier fuses could make a difference too. In my amp work, I got to a place where it was hard to differentiate signal path from power parts and paths in terms of the sonic effect. Changing about anything in there makes a sound difference to me, especially with the right parts changes. Associated, to me, changing power supply bypasses, brand, types, and values, can be heard similarly to changing coupling caps.
I don't know how those boards are organized though, what fuses are used, and how they might effect the sound individually and collectively..so can't comment on that without experience.
Hopefully Steve and others who have played with these fuses will comment.
But in the meantime, I might be inclined to just play with the IEC first anyway, and see if you like what you hear. Also if you are not careful and familiar with them, opening a tube amp can be dangerous, while possibly effecting your warranty....
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