Dimensions of the Geiger-Muller Tube Holder on the GGreg20_V3 Geiger Counter PCB
Recorded: May 27, 2026, 11:03 p.m.
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Dimensions of the Geiger-Muller tube holder on the GGreg20_V3 Geiger counter PCB - IoT-devices, LLC - Electronics manufacturer for IoT
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Dimensions of the Geiger-Muller tube holder on the GGreg20_V3 Geiger counter PCB Post published:03.11.2025 While we included the basic dimensions in the datasheet for the GGreg20_V3 Geiger counter module, these are not all the measurements we are occasionally asked about. Note: The GGreg20_V3 was originally designed for the SBM20 tube, but its Soviet-era stock quickly ran out, so we specifically chose the even better J305 tube as a replacement. This means the standard SBM20 will also fit the module, as it was the tube we originally designed it for. It turns out that the Chinese market offers J305 tubes with varying dimensions. This is why we want to explain exactly which J305 tube (or similar) will fit the GGreg20_V3. Further on, we include a technical drawing with dimensions and a few photos to clearly illustrate the setup. We also provide a photo of several J305 tubes from the latest batch, which clearly shows that while J305 tubes have minor size variations, they can be considered identical for our purpose. In several years of working with the J305, we have only encountered two initially defective tubes, as well as one tube that significantly differed in size from the rest of the batch and from the dimensions specified in the datasheet. We hope this publication will help you understand which tube to choose so that it fits the module, particularly in terms of length. Tags: DIY, geiger-counter, GGreg20_V3, J305, technical-note Read more articles You Might Also Like Power supply module for IoT devices on ESP8266 or Arduino. Great solution. 17.10.2021 The story of the development of one device in four episodes. Episode 4. We connect the GGreg20 registrar to the ESP12.OLED Controller 10.06.2020
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This technical note details the dimensions of the tube mounting on the Printed Circuit Board (PCB) of the GGreg20_V3 Geiger counter module, providing information supplementary to the standard datasheet measurements. This information is specifically intended for makers who wish to acquire the GGreg20_V3 module without an integrated tube, allowing them to source compatible tubes independently. The module was originally designed for the SBM20 tube, but due to supply constraints, the developers substituted it with the J305 tube. A key purpose of this supplementary documentation is to clarify the compatibility requirements regarding the physical size of the J305 tube, as the dimensions offered by the Chinese market can exhibit variations. Therefore, the authors provide specific dimension data based on the J305 tube currently supplied with the GGreg20_V3, using data provided by the J305 tube supplier from China. To mitigate potential fitting issues for the end-user, the note includes technical drawings and photographs illustrating the setup and several examples of the latest batch of J305 tubes, demonstrating that while minor size variations exist, they are considered functionally identical for the module's purpose. The primary objective is to assist users in selecting a tube that correctly fits the module, particularly concerning the tube's length. |