[R-390] Suggested Test Equipment for R-390A Alignment ??

[tburr@dixie-net.com]

Can anyone suggest/recommend a good basic list of "test" equipment to
check the operation of the R-390A.  Is the AN/URM-25 absolutely a must -
or can anyone recommend a specific substitute type signal generator ?  I
have 2 R-390A's in storage that were operational years ago, and want to
get them out put them to use ("If my back does not give out on me").  I
plan to be asking a lot of "stupid" questions in the future, so please do
not be too harsh on me.  I am not a tech, but I am sincerely interested in
learning about the R-390A.

Terry.