Thanks!
Do you also know why rosewood replaced solid maple and why alder was added as a body wood option?
So alder bodies and rosewood boards were never used on singe coil equipped P's, right?
I think rosewood might have replaced maple because some players were not happy with the way the finished maple necks were wearing- in those days there was zero charm in the idea of a worn bass, it was just considered dirty looking, especially the way the bare wood darkens on a maple neck, I guess.
But I am certain that alder was introduced to make it easier and cheaper to finish the bodies- alder took less sealer than ash did, and I guess the solid finishes covered up a bass that was sealed less heavily. This is the explanation George Fullerton gave, there was no consideration for tone woods then at all.
In the '50s alder and rosewood never appeared together on a SCPB, though there were some sunbursts in alder with maple necks.
I have heard the SD QP SC PUP (how's that for an acronymic mouthful?), and it's a great sounding PUP on these basses. I'm not a fan of the QP split coil but I really like the single-coil one.