I have an SP-3a on the shelf. I need to update the caps in that one. It could probably use a new set of resistors and coupling caps. I put Clarity caps in one for a friend and really liked the improvement. The carbon comp resistors have to be long in tooth by now and many may have drifted. I don't know if I'm like those musicians that need to have new cc resistors replace the old ones of if metal film will work. I think more of the sonics of that preamp are from the design, not the old resistors.
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