Dimensions of the Geiger-Muller tube holder on the GGreg20_V3 Geiger counter PCB
Summary
The article provides a technical note on the Geiger-Muller tube mounting dimensions for the GGreg20_V3 PCB. It expands the datasheet with detailed tube-length considerations, confirms compatibility with J305 tubes, and discusses small batch variations observed in practice, aided by photos and datasheet references.