Radio Bussum and the Erbee/Holland tube

Radio Bussum made receivers with double-ended (Edison 14 bases) tubes with cylindrical anode. The first receiver was advertised in Radio Nieuws of 1-11-1918. The second receiver was advertised in Radio Nieuws of 1-4-1919.

Actual monting of the tube

Radio Bussem advertised the Erbee tube in the period March – July 1920, which was also a double-ended tube with cylindrical anode. Radio Bussum was a set and radio parts manufacturer, not a tube manufacturer. Who was the manufacturer of this tube?

There were only two early Dutch double-ended tubes with cylindrical anode. The Heussen type LVB and the Holland tube. The Erbee was certainly not a Heussen LVB. So it must be a Holland tube.
The Holland double-ended tube was developed at the Metaaldraadlampenfabriek Holland on order of the Military and was a military secret. So there is no picture or data at all of this tube but it had a cylindrical anode.
It was developed in the period November 1917-Januari 1918, but was already outdated when the Philips Ideezet came available in June 1918. The Holland tube was a low vacuum tube and the Philips Ideezet had a small amount of argon gas inside, which made it a more sensitive detector.
 

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