[R-390] re search fro 30:1 part 2

[wli]

Having satisfied myself that the IF-audio decks were OK, rechecked the end-to-end S/N as outlined by Roger. It was 12:1. Readjusted the IF gain for -10dB with the line meter at -10 and line meter gain at 10. Went thru polling all the tubes. Minimal benefit, as I had done it previously. Now 14:1.

Pulled the RF-Xtal decks, found the caps and resistors to within 10%. Accessible interior ground lugs were retightened.  DeOxit'ed all tube pins. Lightly burnished all the mounting surfaces to the main chassis including the back of the front panel. 

Upon recheck of the S/N it was 26:1 end-to-end!  
Could it have been just  bad tube or deck chassis contacts?. 

W. Li
62 Capehart