This is an interesting question and in particular while I am in search of a used 32.
I know that changing the caps in a poweramp can sometimes do wonders.
A friend of mine changed all caps in a 20 year old Sphinx Project 18 and as this amp is always on (also in standby) these caps must have been really worn. After the replacement he found he had a new amp.
I guess that in a pre-amp the caps get stressed less, but if it is 20 years old it might give you a new sound.
Not sure what I will do when I find one.
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