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 2.GQ Geiger Muller Counter
 Voltage adjustment GMC-300+ V7 board

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T O P I C    R E V I E W
vikisonline Posted - 06/27/2019 : 17:25:56
I have a GMC-300+ and it says V7 on the board inside.

I bought this with the hopes of using other tubes in it,
but it seems like there is no pot to adjust the voltage any more?

Is there a way to still change the voltage by soldering resistors maybe?
I was hoping to put an SBT-9 in it or maybe some LNDs (though LNDs require much much higher voltages)
5   L A T E S T    R E P L I E S    (Newest First)
Geo-Johnny Posted - 06/28/2019 : 12:15:18
I am confident that we will find a simple hardware solution to match another counter tube such as the SBT-9. Good things take time.
EmfDev Posted - 06/28/2019 : 12:01:05
On the new hardware unfortunately there's no way to adjust the voltage anymore. Our engineer said that this new hardware is more reliable than the old.
Geo-Johnny Posted - 06/28/2019 : 08:23:22
Thank you. We will look forward. Maybe there is another user who has already realized the conversion from the M4011 to the SBT-9 tube.
vikisonline Posted - 06/28/2019 : 07:18:25
I chose the sbt-9 because its voltage requirement is very close to the original m4011. I'll let you know if it works with no modification, I should have it in a week or so.

But ideally I should be able to adjust the voltage :(. All the older models had this capability, not sure why it was removed.

Without that sbt-9 might work, same for the 20 tube. but the better lnds will never work at these low voltage.
Geo-Johnny Posted - 06/28/2019 : 05:37:58
quote:
Originally posted by vikisonline

I have a GMC-300+ and it says V7 on the board inside.

I bought this with the hopes of using other tubes in it,
but it seems like there is no pot to adjust the voltage any more?

Is there a way to still change the voltage by soldering resistors maybe?
I was hoping to put an SBT-9 in it ...


Exactly this problem I have with a GMC 320 + V5. On the board is also V7 and no potentiometer for the high voltage. It would also be interesting for me how you could realize the conversion to a SBT-9 counter tube? Pictures would be very nice too?

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