Valves

[BeJay]

Pop Quiz. Does anyone know why the valve on the left is not working?

[parkview]

1) It's not plugged in? But that's too obvious
2) no getter. Manufacturing missed the getter phase, so too much bad gas still inside?

[BeJay]

It just leaked in some air through the not quite sealed tip over time.
The getter has been flashed, but it's contents has been recombined with air and left a tiny skim of titanium oxide, where it flashed onto the glass. This is in a 50 year old radio gram that otherwise works fine. I'm trying to source a new tube which is a 6an7/A or a ech80 equivalent.



I had a few leaky paper wax caps, but replaced them and all is good there.


All made in Australia.

[DylanM]

What are these?

[seaton]

What are these?

Think of them as transistors before there were transistors.