![Image](http://bjshed.better-than.tv/projects/audio/radio_gram/large_slides/Valve-problem.jpg)
Valves
Valves
Pop Quiz. Does anyone know why the valve on the left is not working?
![Image](http://bjshed.better-than.tv/projects/audio/radio_gram/large_slides/Valve-problem.jpg)
![Image](http://bjshed.better-than.tv/projects/audio/radio_gram/large_slides/Valve-problem.jpg)
Re: Valves
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?
![Laughing :lol:](./images/smilies/icon_lol.gif)
2) no getter. Manufacturing missed the getter phase, so too much bad gas still inside?
Re: Valves
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.
![Image](http://bjshed.better-than.tv/projects/audio/radio_gram/large_slides/IMG_0304.JPG)
I had a few leaky paper wax caps, but replaced them and all is good there.
![Image](http://bjshed.better-than.tv/projects/audio/radio_gram/large_slides/IMG_0311.JPG)
All made in Australia.
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.
Re: Valves
DylanM wrote:What are these?
Think of them as transistors before there were transistors.
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Thingiverse: https://www.thingiverse.com/seaton/
Github: https://github.com/madeinoz67