Okay. Well I soldered the drain wire at center pin on D and also replaced the broken cable and checked all the other cables for cold joints. I also did as Doc B suggested and checked for continuity on the tube socket terminals at D1 and D6. My results are still very low readings - comparable to my first measurements on D1 and D6. This time around my results were 4.8 VDC on D1 and 3.2 VDC on D6.
