GQ Electronics Technical Support Forum Active Users: / Visits Today:
Highest Active Users:
GQ Electronics Technical Support Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 GQ Electronics Forums
 2.GQ Geiger Muller Counter
 GMC-300, How to change GM tube and Set HV?		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

ska

10 Posts
Posted - 09/05/2012 :  23:54:59  Show Profile  Reply with Quote
Hi
Could I know how I can change GM tube and set HV suitable for new tube?

At the moment I haven't ant GMC-300, I would want know before purchase.

Thanks!
Reply #1

ZLM

1261 Posts
Posted - 09/08/2012 :  20:11:35  Show Profile  Reply with Quote
The GMC-300 HV is able to provide up to 700~800V tube voltage. This voltage works on most of tubes. There is a adjust potentiometer for the voltage adjustment.
Go to Top of Page
Reply #2

garyt

8 Posts
Posted - 09/12/2012 :  20:42:42  Show Profile  Reply with Quote
After looking at the HV in the GMC-300, it looks like it needs an extra multiplier stage to get up to the 900V that a pancake probe needs to operate. Before I do that though, I wanted to know what U5 is (on the low-side detector circuit between C9 & C26). I'm afraid of blowing it up if I go up to a 900V GM tube.

Thanks again for all of your help!
Go to Top of Page
Reply #3

ska

10 Posts
Posted - 09/13/2012 :  23:09:07  Show Profile  Reply with Quote
Ok
Could I set the new sensibility in GM software or I must use CPM only?
Thanks
Go to Top of Page
Reply #4

BlueSky

25 Posts
Posted - 09/14/2012 :  10:52:28  Show Profile  Reply with Quote
ska, I have a GMC300 I bought a few months ago with the Russian SBT9 tube installed by GQ in perfect shape so it can pick up Alpha/Beta/Gamma. Comes with everything you need including the replaced M4011 tube. I spent well over $300 total for all of it including the recal that was done the right way.
I'm going to post it up for sale tonite ot tomorrow for $245 (includes shipping). What I did to get that price was to see how much everything is going for now as to not rip anyone off. ZLM will remember me. I just don't need it anymore and has only been used est 50 times for a few minutes at a time.
Edited by - BlueSky on 09/14/2012 10:56:20
Go to Top of Page
Reply #5

ska

10 Posts
Posted - 09/15/2012 :  06:38:12  Show Profile  Reply with Quote
Thanks blu sky, but ilive in Italy! I bought a GM-300 used, but a I need alpha detection.
Thanks
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
GQ Electronics Technical Support Forum © Copyright since 2011 Go To Top Of Page
Generated in 0.08 sec. Snitz's Forums 2000