I bought a couple of B&K Television Analysts with the intent of fixing one of them.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=140136583787
http://cgi.ebay.com/ws/eBayISAPI.dll...m=170128981748
Reading the manual, I gather it's a pretty amazing tool. Seems as though it can inject a signal at just about any point in any (vintage) TV and give a go/nogo indication for that stage.
I'm putting the Admiral aside while I restore one (or both) to working, then maybe I can learn more with it to fix the Admiral. The manual claims any seasoned idiot can easily diagnose any TV problem with it. Including audio. We'll see if it's true.