P-Series Valves, what to do with them?

[pwdrive]

Ref. Post#32: There's also the difference in the Ia-Va curves and the Ia-Vg curves, I realise that for those that the voltages (Va=Vg2) are different but at a 50 volt difference the difference in Ia seems disproportionate:

Ia-Vg curve for the EL84, Va=Vg2=250v...Vg1=-ve10volts Ia shows 22mA.

Ia-Vg curve for the PL84, Va=Vg2=200v...Vg1=-ve10volts Ia shows 160mA.

Lawrence.