[Guitarist28]

I've attached what I am seeing and measuring as the pin outs for the EL84 valve. Pins 4 & 5 must be the heaters as pin 6 has no connection. Again, with the connection to ground, the measurements are as follows:
pin 2 = 0.0025v
pin 3 = 0V
pin 4 = 1.3V AC
Pin 5 = 1.3V AC
pin 7 = 276V
pin 8 - n/c
pin 9 = 251V

I believe that the heater voltages appear low.

Best Regards