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Amperex 6DJ8 tube construction

Here is a link to a picture of two Amperex 6DJ8 orange globes.
- The one on the left has a circular plate suspended between the grid and the O getter.
- The one on the right does not have the circular plate suspended between.

What does that circular plate do? Why is it not necessary in the other tube? Any other info?  Thx!



steakster

Showing 2 responses by lowrider57

lowrider57's avatar
lowrider57
5,397 posts
 
I agree the one with the extra plate may be a ruggedized tube.
Does the left tube have the same Amperex logo? This is a guess, maybe the tube on the right was made in a Mullard plant and branded Amperex Holland. That happened sometimes.



lowrider57's avatar
lowrider57
5,397 posts
 
Maybe try Googling vacuum tube mica. Or mica types.

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