It’s never good when the resistors glow. It means there is too much current going though it. How is it sparking? My guess is that it’s glowing because it’s sparking and not drawing current elsewhere. Does it still spark with the tube removed? Sparking is an indication that it’s shorted (to ground) somewhere, possibly the via between C10, C9, and one of the pads of R15. Make sure you only have enough solder on the resistor pads that you need, and it’s not spilling over to the copper ground plane (or vias) around the pads. It might help to use some electronics flux (not plumbers flux) to clean up your solder joints if necessary. If you can’t see anything obvious from the top side of the board, then you’ll have to take it out and look for shorts on the solder side. Look for black burn marks on the PCB where it was sparking as an indication of where the shot is. Try to refrain from turning it on until you think you’ve found and fixed the problem, otherwise you might blow the fuse.
Good luck.
Let me know what you find.
-Brach