This service manual covers the Wurlitzer 4100, 4102, and 4150 organs, as well as their letter-suffix variants like the 4100A, 4100BD, etc. These are all compact organs with two 44 note manuals, 13 bass pedals, and vacuum tube tone generators.

Here we talk about what the original document included, and how we converted our master scans into a printable reference PDF.

One thing we’ve been thinking a lot about is how to classify the documents so that they’re easy to browse. We want the archive to be usable by everyone, including people who are unfamiliar with the minutia of Wurlitzer organ models. One way to do that is to group documents by subject, so people can seek out the information that interests them. The most common subject in the archive is the electronic organ, so grouping all of the organ documents together would create a massive subset of the archive. Clearly, we have to split the Organ category into a few subcategories. Or do we?

The purpose of scanning the documents is to preserve important technical info for everyone who plays or restores Wurlitzer organs. Although we can only scan the small documents right now, there’s a lot of information in the large documents. We don’t want that information locked up in a mystery box. To that end, we’ve been cataloging the larger documents.

One thing that I guess shouldn’t have been surprising to us when we started going through the 100,000 page document archive that we have been scanning, is the fabrics we found.  So far, in just about every other one of the Wurlitzer factory organ documentation drawers there was an original organ grille cloth swatch.