12-26-2023, 08:48 PM
It appears to me that block 46 has been relocated to the low position in the photo and the mystery block is in the upper spot. The power line is connected to the lower block.
The 20K and 51K voltage divider is connected to the upper block. Looking at the schematic, that point has part 16 (0.1 mfd) supplying screen voltage to two tubes. Part 16 is probably in the unknown block. I checked earlier for a service bulletin but couldn't find one. It looks like this configuration has been there awhile, can't explain why it's this way. You'll have to check the wiring to verify that point runs to the screen grids and the wiring for the other lug.
The 20K and 51K voltage divider is connected to the upper block. Looking at the schematic, that point has part 16 (0.1 mfd) supplying screen voltage to two tubes. Part 16 is probably in the unknown block. I checked earlier for a service bulletin but couldn't find one. It looks like this configuration has been there awhile, can't explain why it's this way. You'll have to check the wiring to verify that point runs to the screen grids and the wiring for the other lug.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
