[Station X]

Something seriously wrong there. There should be no AC voltages present apart from on pins 4 and 5, the heaters, which look OK assuming a centre tapped heater supply.

Apart from that I think you're numbering the pins the wrong way. Looking from UNDER the chassis the pins number clockwise from the gap or spigot.

I'll reverse the pin order for the EL84 and see if it makes any sense.