There's also a couple of coils - that Silicon Chip article explained the typical technical guts. And those cheapie Chinese ones that burn out real quick - I had one go only the second time I switched it on - so i took it back the next day with my receipt! - they often skimp on the quality of some of the components (putting a 15c one in, instead of a 20c one), especially the high voltage capacitors, and that's what dies first with them.