Yeah, here's a schematic of the one I've been referring to.
http://www.drtube.com/schematics/marsha ... 2-iss7.pdf
Fuse blows, Current flow through limiting resistor and LED to light it up. The current limiting resistor also biases the tube deep into cutoff without completely lifting the cathode, which can theoretically damage the tube.
If you build an amp with this feature for someone they will think you are a genius.
Output tube cathode fusing
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Re: Output tube cathode fusing
Nah, they'll still be pretty sure I am a moron. 
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.