EO 509 receiver - multiple versions

[kriegsfunker]

I have the EO 509 III, and I know there was a version "II".   Does anyone know what the differences were between these versions?

[val]

Yes there was version II:

https://picclick.de/Original-WH-Lorenzempfänger-EO509-II-163656435641.html

And also version I. In the beginning there was E090.

http://www.seefunknetz.de/e090.htm

I don't know the exact differences between I/II/III, i suspect they were just

modifications over the production, maybe also some frequency range differences.