strange tube G1 S/5

[barretter]

I think it's a barretter, too.

 

[Miles Prower]

That thingy is a current limiter. These typically have iron filaments that operate in a hydrogen atmosphere. The operating temp is a dull red heat. It's basically a primitive CCS, often used to keep Nernst tubes from going into thermal runaway.

 

[EC8010]

What was I saying? Nitrogen came out when I meant to say hydrogen. Dysloxic tipping.