Hi George...this looks typical of Early blight which is pretty common in tomatoes, and the Brandywine heirlooms might be more susceptible. You need to pluck off the affected stems/leaves and throw them away.  Also, you may want to prune the rest of the plant to make sure there is plenty of air circulation.

Take a look at our website on tomatoes...there is some really good information that may be even more helpful.

https://extension.umd.edu/programs/environment-natural-resources/program-areas/home-and-garden-information-center/master-gardener-program/volunteer-resources/year-heirloom-tomato/

Robin