February 23, 2023 at 11:31 am #16210
Following is a link to a site that has a simple B+ power supply schematic, just scroll down and you will see it.
I use an ARBEIII Universal Battery Eliminator for my battery radios which works really great. It is really easy to use and simple to hook up. There is also a 81 page set of connection diagrams for the early battery radios. Following is the site for the eliminator. I have also attached the PDF file containing the connection diagrams.
Hope this helps you.