[R-390] R390A test rig

[guido]

The OS8/U oscilloscope appears as part of the test setup in the original =
R390A manual with the URM 25D signal gen. Upon working on several =
OS8/Us, I have found that the usual culprits in most malfunctions are =
the multiple section electrolytic caps of the power supply. Replacing =
them brings back the little 3" scope as good as new. Of course any paper =
caps especially in earlier models should be replaced but always go after =
those filters first. Just a note for those who like to see some action =
on the CRT while operating the R390A or nonA or would like to use it in =
an original test set up. Take those scopes out of the storage and get =
them to work. The little devils have a lot of life left in them for =
years to come and they look quite nice beside our beloved 390s.

Best 73s to all,
Guido Santacana KP4FAR
San Juan, PR-USA

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