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Siemens EL34 tube

Siemens EL34

 

Siemens EL34

Siemens EL34 doosje

 

There is a code at the bottom of the glass of the tubes. With my Siemens tubes, for example B5A2 or B5B4.

The letters and numbers of the tube type (such as this EL34) have a meaning.