help vd2 ppi radar unit tube does not light up

hello I'm new here and have a small problem I'm working on a vd2 ppi repeater fro a battleship the problem I'm having is the unit works fine except the tube does not fire up I'm assuming its a lopt or tube problem i have spares for both and am going to try them tomorrow but is there anything I'm missing i tested the leads and the tube filament at the base lights but the tube doesn't come on leading me to believe the anode Has no voltage or very little it read 000.8 kva on the meter that seems low to me but I'm not an avert so any help would be greatly appreciated thanks