[R-390] R211

[wli]

Craig:

I think that you may very well be correct, the local effects of overheating belie another mechanism, since all the other compartments look pristine. Maybe the HR202 *ran* away some time in the past. Anyway, all the functionality was there before... have to check out that particular area meticulously. I disabled that oven seeing as how my operating environment is very benign: being between 65 and 85 degrees with 40% humidity. 

The triggering event for this project was failure of the 20:1 end-to-end test which seemed localized to the RF deck, not changed with tube swapping or alignment. When I tested just the IF-AF decks I got a 37:1 ratio (repeated 4x on different days).

Yes, it is good practice getting the RF deck out. Not too bad once you release all 13 green 6-32 screws. 

Thanks

W. Li