I « rebuild » my Geiger counter, the SBM-20 tube was initially inside the box, so, i have put this one inside a 32mm diam plastic tube,…
HF Propagation
HamRadio & electronic's stuff
I « rebuild » my Geiger counter, the SBM-20 tube was initially inside the box, so, i have put this one inside a 32mm diam plastic tube,…