So that is a voltage of 36 V (124-88) over a resistor of 110K.ohm (100+10K.ohm), meaning an anode current of only 0.32 mA.
That is a very low value!
Ideally you should have a current in the order of (a little over) 0.5 mA, that will set the anode voltage to about half of the supply voltage. A different anode voltage will work, but the maximum SPL without significant distortion will be lower.