I think the circular plate is called a splatter shield. I don’t know what its function is.
Tubes from the Phillips factories (Amperex, Mullard, Siemens, La Radiotechnique, Valvo, etc.) made in one factory often carried the label of another Phillips factory. I have lots of examples of this.
The only way to be sure where and when a Phillips tube was made is to read the etched code. Sometimes part or all of the code is unreadable. I can see the delta etching on the tube on the left, which means it was made in the Heerlen Amperex factory. You would have to talk to someone a lot more familiar with tube construction than me to find out where the tube on the right was made.
Here is a link to the Phillips codes if anyone doesn’t have them:
https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
The tubes we’re discussing and any we’re likely to come across would have the ’NEW’ CODE etchings.
Tubes from the Phillips factories (Amperex, Mullard, Siemens, La Radiotechnique, Valvo, etc.) made in one factory often carried the label of another Phillips factory. I have lots of examples of this.
The only way to be sure where and when a Phillips tube was made is to read the etched code. Sometimes part or all of the code is unreadable. I can see the delta etching on the tube on the left, which means it was made in the Heerlen Amperex factory. You would have to talk to someone a lot more familiar with tube construction than me to find out where the tube on the right was made.
Here is a link to the Phillips codes if anyone doesn’t have them:
https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
The tubes we’re discussing and any we’re likely to come across would have the ’NEW’ CODE etchings.