@rdtsc Some of them do glow a dull red heat, viewed in the dark. Globar® has been making power resistors since the middle of the 20th century, but I think some firm bought them. Please see my question to you about silver soldering. Maybe it would make a good question here.

@NickAlexeev Looks like a lot of monkey business to me! ;-)

stupid question so I don't post a question as a dupe:

I'd like to make a device to trigger a 5V TTL from a ~0.6 ms, ~10 mA (but potentially ~100V or higher) output from a cardiac pacemaker