Green glass Triode? Diode? Gammatron? Wunderlich?

 

Guest / visttor Andre MONTALD, Leuven België  writes.
 

I am the owner of this electronic tube. Sofar I have not been able to trace which type of tube this could be. Therefore the picture. The greenish transparent glass has only the label indicating that it is Made in Holland by Philips. No other indication can be found. One can distinguish a spiral, rather heavy, heating element. Does it serve the purpose of a cathode? There are two flat metal plates (anodes?) on each side as well as a wire grid which is electrically connected to the filament heating element. Is this a double diode rectifier? Or has the tube another purpose? Why the grid? Why the green coloured glass? Someone suggested it could have served in early TV experiments? The greenish coloured glass filtering predominant red colours when used as a projectors illuminating tube ? Who can tell me which type of tube or valve this is?

Some other pages maybe relevant. To me it looks like some kind of Gammatron type tube except not enough pins? If the grid structure is really connected to filament, then it must be a double diode? It would need 5 pins for the grid like structure to be independent unless the two plates are on the same connection.

Blue Arcturus 180 is a similar envelope Dual Diode but electrodes are not the same.

 

Dual Plate Triodes

Wunderlich

To thank the Author because you find the post helpful or well done.

Ae the tube markings in English?

To thank the Author because you find the post helpful or well done.

I placed an inquiry about your post in the Tube Collector's Association yahoo newsgroup and Eric Tauechio showed a photo of a tube with a similar inner construction that was a Mercury lamp. His tube was Philips Ultrasol 5013 UV-sunray lamp.

Eric suggested that the green coating may prevent UV radiation. He also suggested that the grid structure may serve a similar purpose to the shielding structures in mercury rectifiers like the 866A.

Regards,

-Joe

To thank the Author because you find the post helpful or well done.