[Guest]

A family member has a 42-390 radio which is not working. I "volunteered" to try and repair it. His chassis was in bad condition.So I purchased a 42-390 which is in good physical condition as far as the wiring and components (caps) are concerned.All tubes fire up except the 7X7 tube (which was subituted for the original XXFM tube). It is supposed to "glow" like the other tubes , right? I was told by the seller (well known antique radio co.) that it worked on B bands. But I have not been able to get sound out of it. This is my first attempt to work on an antique radio, I am a computer tech w/ 35 + years of repair, with t/s to board level experience. Where can I get a manual with test points to T/S . Would the fact that the 7X7 tube is not "glowing" keep the radio from generating sound on all bands? Do I need to replace the 7X7 tube? Any thoughts on how to proceed will be greatly appreciated. Thanks, Joe