Word to the wise:
The 24v connections only have smoke that's rated for 24v of smoke food. You can apply 24v to the 208v smoke food rated terminals, but it won't do you much good. But you should absolutely never connect the 208v smoke food supply to the 24v smoke food terminals.
Your smoke will over eat, become fat, and explode.
Similarly, if your 2 watt rated resistors feeding the output stage of a headphone amplifier are starting to show signs of smoke loss, maybe you should double check that you didn't use two n-type MOSFETs in the push/pull output stage of that channel. You big dummy.