[Boatanchors] Patterson PR-12 Help Needed

[Joe Connor]

I picked up a Patterson PR-12 at a hamfest today and need some information. According to the Radio Blvd. site, this is a rare set: After engineer Ray Gudie left Patterson over a wage dispute, Emmitt Patterson tried engineering the new PR-12 but soon discovered he was completely out of his element. Patterson hired Karl Pierson to complete the PR-12 but Pierson took one look at it and scraped the whole project. Though the PR-12 appeared in a few advertisements in late 1934, it was never in production.  A picture can be found here: http://n7rk.com/patterson2.htm  Note the off-center knob arrangement.

Here's the help I need:

1. Does anyone have a schematic? It's not in Rider's and doesn't seem to be available from any of the usual suppliers of vintage manuals. Might it be in the Gernsback manuals? Has anyone worked on a PR-12?

2. Here's where I'm a stumped. The output tubes are push-pull 42s, yet the speaker socket is a four-prong socket. In fact, it's labeled 80, suggesting that it was scrounged at the factory from left-over parts. I've got no B+ on the plates of the 42s. A later Patterson with push-pull audio (PR-16) has a five-prong socket. B+ is fed through the center-tap of the primary of the output transformer to the plates of the 42s and the other two prongs are the field coil. How could the push-pull PR-12 work with only a four-prong socket and how could B+ be fed to the output tubes? An earlier Patterson, the PR-10, has a four-prong plug but that makes sense because it has a single output tube. I guess that I could connect the center tap of the output transformer to the prong that has B+ (after it has gone through the field coil). Does that make sense?

As always, thanks.

Joe Connor