There is a *what* in there?
So, in the lab we have a small muffle furnace (goes up to 1000 deg. C, mainly used to burn small samples to measure the ash content). It doesn't get used a lot, but it is needed from time to time. But, it isn't working right now, the temperature controller has evidently failed. So, I open it up to see if maybe something obvious is wrong -- and there, right in the middle of the controller electronics, is a vacuum tube!
I knew this thing was a bit elderly, but I didn't think it was *that* old. I wonder how many other pieces of occasionally-used equipment are around here that still have vacuum tubes in them?
I knew this thing was a bit elderly, but I didn't think it was *that* old. I wonder how many other pieces of occasionally-used equipment are around here that still have vacuum tubes in them?