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Experimental "four-in-one" tetrode
TÚtrode multiple expÚrimentale
Experimentelle Mehrfachr÷hre

A very curious "four-in-one" tube!

Experimental four-in-one tetrode

Four tetrodes, with a common control grid
Assembly: a strong triple mica plate on one side
No markings

Experimental four-in-one tetrode

Hauteur de l'ampoule • Bulb height • Birnen H÷he : 5"1/2 (140mm)

Experimental four-in-one tetrode

Experimental four-in-one tetrode

Experimental four-in-one tetrode

 


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