I downloaded a manual from BAMA for an R-4b but find quite a bit of
difference from the 4b in the BAMA manual and the one I have. The BAMA
version has 10 tubes and mine has 9. I suspect mine is more of a hybrid
version and has a serial number of 9737C.
Any Drake gurus out there that can point me to a source for the correct
manual/schematic for my 9 tuber with the above serial number?

Thanks for reading, Rob Mills

PS, I also have an additional jack with factory marking "spare", The BAMA
version shows an un-marked empty hole there.