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 2.GQ Geiger Muller Counter
 GQ GMC-060,080,280 GMC-300,GMC-320 customized tube

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T O P I C    R E V I E W
ZLM Posted - 06/24/2011 : 07:22:48
This is a GMC-080 kit main board.


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30   L A T E S T    R E P L I E S    (Newest First)
Stargazer 40 Posted - 10/05/2019 : 11:34:47
In post #5 of this thread I mentioned that I acquired an SI-8B pancake tube from Lithuania

h**p://gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=5554

I also acquired a simple GMC PCB board and case from that vendor. The SI-8B is quite large and unlikely to fit in the 600 case if I recall correctly. The GQ power supply should power it fine. The GM tube came with a steel clip on cover for shielding betas. The built meter with vendor supplied case and battery power works quite well, but very limited capabilities from op system and GC board. I am away from it at the moment but will post some pics in comparison with the 600 to show scale. Till then here is a pic of the completed meter and two more of the business end of the tubes, and finally the beta shield in place over the SI-8B. I also bought the vendor's SBT-11 version. These are simple counters and have ability to manually adjust voltage, but really quite limited. The case is almost twice the size of the 600.

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The best way to employ this with the 600 is to buy it in a wand variation such as this one on Ebay and wire it in as a DIY.

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I'll post pictures when I get back to my meters.

Searinox Posted - 10/05/2019 : 10:31:11
Has anyone tried to install a SI-8B tube in a GMC-600?
Geo-Johnny Posted - 09/11/2019 : 22:53:08
Nice that you like it, thank you. The SBT-9 counter tube is an end-window alpha tube and is sometimes available on Ebay for around $ 40. Example: https://www.ebay.de/itm/SBT-9-9-Geiger-counter-tube-For-dosimeter-radiometer-Beta-gamma-detector-/352600196646
The SBT-9 is not as sensitive in the beta and gamma range as the M4011 or the similar LND712 counter tube, but enough to experiment with. The offered SBT-9 counter tubes are all new but older years of construction and were used on Russian spacecraft.

Edit: The SBT-9 has no integrated anode resistor! Ideal is according to data sheet a 10MOhm resistor.
Stargazer 40 Posted - 09/11/2019 : 14:01:09
Very nice! Is the SBT-9 an end window tube like the LND 712? How much did the tube cost? Did it come with resistor?
ZLM Posted - 09/11/2019 : 13:58:17
Excellent work. Thank you for sharing your design.
Geo-Johnny Posted - 09/11/2019 : 12:41:21
GMC-320+V5 extension with a SBT-9 Russian Alpha, Beta, Gamma counter tube.:


Two-pole DIP switch for selecting the counter tube. 1 on, 2 on, or 1 & 2 on.:


Accessible from outside through the battery compartment.:


An additional hole in the housing for the mica window of the SBT-9 counter tube to measure the alpha radiation.:


Of course, the layout had to be changed on the board on the cathode side of the counter tube. Counter tube 1 (M4011) has the original 3MOhm anode resistor and Counter tube 2 (SBT-9) is operated with a 10MOhm anode resistor.
v3ngence Posted - 03/21/2017 : 19:40:02
Still have to make a probe handle for my SBT-11A but check out these ionization flashes!
Works in parallel with stock tube on my GMC-320:

h**p://www.youtube.com/watch?v=_3MVGWw54bs

ZLM Posted - 02/07/2017 : 20:16:18
The tube voltage will OK. But you may need to adjust the input capacitor on board.
U-238 Posted - 11/28/2016 : 06:43:23
I reworked the design and made it more modular. Instead of a case extension, I made an external probe. The modular system uses a BNC connector. The problem is that the BNC cable has a resistance of 75ohm. Do I need to raise the tube voltage?
U-238 Posted - 11/22/2016 : 19:03:19
Hi, I am going to order my sbt11a soon and have designed a modular system. I have designed a case extension that you can 3D print. It slides over the right side of the Geiger counter. It stops about 1 inch in and leaves 1.5 inches of free space. I plan on using it for my SBT11a. I designed it specifically for it. I will post a link to the file soon. I also will be making it modular so I can change tubes quickly. Thinking of using a BNC connector or something similar. let me know what you think.
CuaC Posted - 03/30/2016 : 23:39:25
Hi! I just got my 320Plus and I'm already waiting for my SBT-11A. I think I will use some coaxial connectors and leave the device ready to plug in different probes. I think I'll probably build an enclosure for the probe itself and then just use coaxial cable to connect everything.

By the way.. I understand I don't need to change the voltage to use the SBT-11A, but is there an easy way to change the voltage in the 320 in case I want to try other tubes?
Distelzombie Posted - 02/16/2016 : 10:14:00
OK, you're right. It works fine. :D
But I'm not sure about the benefit...
ZLM Posted - 02/08/2016 : 21:03:35
The tube circuit should be able to drive two tubes.
Distelzombie Posted - 02/06/2016 : 05:08:40
What would you say? Will it work with both tubes In in?
ZLM Posted - 01/21/2016 : 13:10:19
Nice.
Distelzombie Posted - 12/30/2015 : 10:31:51
Hi.
I just finished my customization!


I choosed a SBT-A11 as it detects alpha radiation and I don't need to change the voltage.
I didn't do it the same as Alchemy2 because I don't have a drill or dremel.
That left me with enough space to fit BOTH tubes in it. But I am not sure if it will work without changes to the electronics and I don't really need the M411 tube now.


I used my soldering tool to melt out enough plastic to fit in the SBT. That's not how you're supposed to use it, I know, but it was the only solution for me. After cleaning it with a scalpel it started to look good though. I bent a piece of fence roughly that I can slip on and off if I need a little more sensitivity for alpha rays.
I glued the tube to the casing and the battery holder with two little drops to the board to kill noise and nuisance.
One problem is the bulge. I'm not sure if I just cut the lid holding brace away or not.


I do like the position of the tube. It has some drawbacks for autonomous measuring, but the handling is Awesome!
I especially like the little sparks that ionized particles leave. :D
ZLM Posted - 12/26/2014 : 09:02:09
See another good one from Alchemy2:

http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=4072

SBT-11A on GMC-320:

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SBT-11A on GMC-320:

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ZLM Posted - 05/28/2014 : 18:00:09
SBT-11 tube on GMC-320+

h**p://www.youtube.com/watch?v=G_0QHbyfgTw


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ZLM Posted - 09/10/2013 : 14:08:35
There is a SBT-11A tube MOD.

See:
h**p://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=3766&SearchTerms=104
and
h**p://radioactivity.forumcommunity.net/?t=50191071&st=60
ZLM Posted - 07/24/2013 : 21:42:12


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ZLM Posted - 12/03/2012 : 14:48:44
Alpha detectable tube installed on GMC-300/GMC-280 (SBT-9) reacting to a uranium ore sample (a good distance away too!)

From brianweber4:

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The SBT-9 mica end window:

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Case closed!

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The SBT-9 tube:

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ZLM Posted - 12/03/2012 : 14:44:16
Alpha,Beta,Gammer Tube
From Automic.Dave:

90.86 KB
ZLM Posted - 03/10/2012 : 10:30:17
From customer Ryan and Odiez1:

http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=3406


From customer Ryan:

2.86 KB

From customer Odiez1:

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From customer Odiez1:

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ZLM Posted - 01/09/2012 : 22:25:28
GMC-280 with M4011



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ZLM Posted - 08/09/2011 : 22:10:45
M4011 tube installation procedure.


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ZLM Posted - 06/29/2011 : 16:17:10

Tube 6107 on GMC-080:

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ZLM Posted - 06/26/2011 : 14:56:29
GMC-080 kit, a CI-3BG Russia Geiger tube installed:

The CI-3BG a is low sensitivity tube.

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16.12 KB
ZLM Posted - 06/26/2011 : 10:22:22
Another two examples:



GMC-060 with GMT-033 tube

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[b]GMC-080 with GMT-02 tube]

38.86 KB
ZLM Posted - 06/26/2011 : 10:05:37
GMC-080 will work in same way for SBM-20 geiger tube
ZLM Posted - 06/26/2011 : 10:01:16
GMC-060 kit with SBM-20 tube installed by Ryan: "I modified the end caps of a SBM-20 geiger tube to fit nicely in the geiger kits I got from you guys. The circuit seems to power the tube just fine even under super high counts. "

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