L2 provides plate feed to V1 so if it's open the DC conditions will be SEVERELY unbalanced. This is almost certainly why R30 is having a hard time, to say nothing of the various tubes. Hopefully they have not been permanently damaged. Running a pentode like a 6AU6 with full screen volts and no plate volts is a recipe for disaster. You can temporarily replace L2 with, say, a 100 ohm resistor or even a short circuit and if the tubes have survived then R30 should run cool and the unit should work OK with no clipping, at the lower frequencies anyway.
L2 and L3 are described in the parts list as RF reactors (chokes). If you can't repair L2 then get a couple of axial 2 mH RF chokes, those ones that look like resistors (or two 1 mH chokes in series) and install them. I wouldn't use ferrite cored power inductors intended for switchmode power supplies as they might not work properly at the frequencies of interest.
Morris
