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Thank guys I'll try to isolate the problem, make some measurements and try to figure out things.
Yes I don't think the counter draws too much current. Suppose it takes 1mA so I^2R ~ 1.8mW. Moreover, there are two resistors in parallel so each would dissipate half the power.
My GM tube doesn't...
Thank you about the picture and your suggestions! I did check it, it's connected to the joint at its right (the copper layer joins them) so it shouldn't be it.
Fortunately it seems it was just the headset wire, so you were right :)
The counter didn't come with any radioactive source. I found...
Actually at 1x I don't get any tac. At x100 I get some, but less that x1000 so I guess this one is the most sensitive. I've tried to listen the tacs without the amplifier, just headsets, and I can barely hear it, it's too low :s
I'm trying to figure out the galvanometer connections. It has 4...
Guys! Success! Well sort of!
I plugged the missing wire and the headset ring to an old PC speaker I had (powered) and.. tac tac tac!
I've measure around 30 tacs per minute (more or less, it's quite random) at around 0.4 kV with the x1000 scale. If I unplug the tube, then I don't get any tac, so...
So I've looking with a lens to see If I could spot anything funny with no luck. I did check continuity in the corroded pits.
When the geiger was given to me, the battery was taken out from where it's supposed to be fixed, so my guess is that the wire was in the way of the battery and the guy...
Thanks a lot for your help, I'll do that and report :D
And yes the generator droped voltage as I tried to measure it with the multimeter so I wasn't able to get a clear reading. Unfortunately I don't have a high impedance multimeter.
Thanks again for all the information. About the tv screen...
Hi everybody! I hope this is the correct section for this...
I've recently gotten an Italian Geiger-Muller radiation counter. Judging by its look, I think it's from the 60s or 70s. The equipment says Misuratore di razioattivita MRG 310 DT SELO, Milano. I've goolged this information but there...
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