[R-390] Servicing Advice on Signal Generator URM-25D

[DCrespy at aol.com]

Dallas' note below.. He makes a great point, if it isn't broken, don't  .....
 
About resistors, just check the resistances from the tube pins to  ground 
(most manuals have a chart).  I usually find at least one with  a problem to 
correct. Otherwise, no wholesale replacements.  (I  confine recapping to 
electrolytics and black beauties.)
 
73
Harry   KG5LO
Saline MI  :

Sure.  Let me prerface my remarks by saying that much of what is  said about 
preventive maintenance on the reflector is baloney.   

Take, for example, the "resistor replacers."  You can't measure  most 
resistors accurately in circuit unless you "lift at least one end," and  if you do 
that, you might as well go ahead and replace  it.