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atomic.dave
USA
65 Posts |
 Posted - 09/03/2011 : 16:44:22
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Does anyone know if this tube requires an anode resistor? and if so, what type/value.
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| Reply #1
ZLM
1261 Posts |
Posted - 09/03/2011 : 18:22:08
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| Yes. All most every tube needs resistor, from 3M hom to 10M ohm. Resistor type is not important. |
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| Reply #2
Odiez1
73 Posts |
Posted - 09/03/2011 : 23:44:37
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Just to throw my 2 cents in here..
By "type" he means wattage rating and composition. In this configuration the resistor isn't really puling any significant load.
And resistors go like the metric system also.
1M ohm = 1000K ohm = 1000,000 ohms.
So a 1K isn't the same as a 1M ohm.
The wattage determines the size really. A .25 (1/4) watt is pretty small compared to a 1 watt.
The most important thing is to see if there is a manufacturer recommendation for the resistance. |
-Odie |
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| Reply #3
atomic.dave
USA
65 Posts |
Posted - 09/04/2011 : 10:38:34
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Thanks O...
When I bought the 080 and the M4011 from GQ, I was under the impression I could just install the tube as is and it was done. (thats what the instructions say from GQ) but do I need to add a 3k-10k ohm resistor in order for it this tube to function properly? And is 1/4 watt the one to get if that is so? and 3k-10k is a pretty wide range of value. What is the best for this application?
quote:
Originally posted by ZLM
Yes. All most every tube needs resistor, from 3M hom to 10M ohm. Resistor type is not important.
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| Reply #4
Odiez1
73 Posts |
Posted - 09/04/2011 : 15:13:50
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Just to 'chime' in again.
I don't think the M4011 needs any mods to work properly in the 080. Mine works great stock, compares closely with my CDV-700 for ~1000+CPM on the check source.
Besides I can't find anything specific on M4011 anyway.
The ebay page for the CBON-6107 says it needs a 1M ohm resistor (one mega ohm), that's 1000k ohms, one thousand kilo ohms.
Your LND coincidentally has the same recommended resistance.
h**p://www.lndinc.com/products/246/
And it shows 1 Meg Ohm...
And look at that, shows a dead time of 75 micro seconds. Cool you got 70 microsecond diodes. :-)
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-Odie |
Edited by - Odiez1 on 09/04/2011 15:22:25 |
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| Reply #5
Odiez1
73 Posts |
Posted - 09/04/2011 : 20:33:31
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I was brainstorming a bit, thinking about why different tubes might need different "tweaks" on the circuits.. So I searched "anode resistance on CPM gm" exactly.
Found this site.. Notice HTTPS.
h**ps://sites.google.com/site/diygeigercounter/gm-tubes-supported
It explains everything I've discovered on my 'trek' through the Geiger Counter world. Even explains why I have the + positive lead for the tube on the shield of my RG-58 coax.
He calls is a '"cathode sensing" technique' as he says.
IT'S AWESOME.
YOU NEED PROPER ANODE RESISTANCE. The stock GMC works safely folks!
Explains the sparks I saw as "stray capacitance"
https://sites.google.com/site/diygeigercounter/gm-tubes-supported |
-Odie |
Edited by - Odiez1 on 09/04/2011 20:38:26 |
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| Reply #6
atomic.dave
USA
65 Posts |
Posted - 09/04/2011 : 23:22:38
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Thanks Aaron!
quote:
Originally posted by Odiez1
I was brainstorming a bit, thinking about why different tubes might need different "tweaks" on the circuits.. So I searched "anode resistance on CPM gm" exactly.
Found this site.. Notice HTTPS.
h**ps://sites.google.com/site/diygeigercounter/gm-tubes-supported
It explains everything I've discovered on my 'trek' through the Geiger Counter world. Even explains why I have the + positive lead for the tube on the shield of my RG-58 coax.
He calls is a '"cathode sensing" technique' as he says.
IT'S AWESOME.
YOU NEED PROPER ANODE RESISTANCE. The stock GMC works safely folks!
Explains the sparks I saw as "stray capacitance"
https://sites.google.com/site/diygeigercounter/gm-tubes-supported
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| Reply #7
Odiez1
73 Posts |
Posted - 09/06/2011 : 13:43:09
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quote:
Originally posted by atomic.dave
Thanks Aaron!
It's my pleasure!  |
-Odie |
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Topic |
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M4011 resistor?
