Why did tubes have inner coating or whatever

Go To Last Post
3 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

It's stupid question time again!

In some glass tubes (vacuum tubes) I noticed that the glass in some parts of the tube was covered with some silvery material. And there always was a metal ring under this area. At first I thought it was shielding or something, but then I saw it in a special incandescent tube, whose only purpose was to emit light, so I assumed, that that would not need shielding.

Why is the extra layer on the glass there? Do I assume correctly, that it was done using that ring (probadly had some chemical substance in it)?

An example: At the very top of this http://upload.wikimedia.org/wiki... tube is an example of what I mean.

There are pointy haired bald people.
Time flies when you have a bad prescaler selected.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Jörg Wunsch

Please don't send me PMs, use email if you want to approach me personally.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Ooooh! Smart!

There are pointy haired bald people.
Time flies when you have a bad prescaler selected.