[ Ref. Jeff Kunkel in 240124 MMDigest ]

With regard to Wurlitzer unit valves, anyone working on Wurlitzer
band organs should know the Wurlitzer 105 and Band Organ Builders
Group: https://groups.io/g/Wurlitzer105andBandOrganBuilders 

There is a huge collection of information there. Most of it is
migrated from the former (dead) Yahoo Group, including several
documents by Bob Humes on unit valves. I don't know if the
particular piece you are looking for is there.

https://groups.io/g/Wurlitzer105andBandOrganBuilders/files/Wurlitzer%20105%20Unit%20Valves 

Wallace Venable