[R-390] 390A ramblings

[n4tua at aol.com]

Dear Friends,
Still working on the 390A. Work sure does cut into my radio fixin. Oh 
well. I have got down to step 11 in the trouble isolation testing and 
have found something. I am putting 3mhz at 10uV with 30% modulation at 
1000hz into E210. I get the required 0vu indication but it is noise. I 
can not hear the modulation tone. While back at E211 I could hear the 
tone fine. Some preliminary checks at V203 look good. Like plate 
voltage 225vdc and cathode voltage around 10vdc. Book says my problem 
is at V203. Any ideas from here?
Thanks, Collin
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