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grid stoppers


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7/29/2005 11:43 AM
scott c grid stoppers
whats the difference between using 5.6k or 1.5k grid stopper resistors?
 
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7/29/2005 12:05 PM
Chris / CMWamps

Hi Scott  
 
The value of gridstoppers in various amps does vary between 0 (none) and 47k ohms.  
You do hear it mostly when fully dimed. Together with the so called miller capicitance it does create a low pass filter and it also does lessen blocking-distortion.  
 
Best advice I can give: just trust your ears and be sure to mount them on the tube-sockets.  
 
Hope this helps,  
 
Chris  
Love, peace & loudness  
http://www.CMWamps.com
 
7/29/2005 12:13 PM
scott c
thanks chris, so it doesnt matter what the tubes are? 6l6 or el34?
 
7/29/2005 2:54 PM
Chris / CMWamps

Hi Scott  
 
EL34s (and 6V6s) do require less ac-voltage going to the grids for full power so they can be a bit more sensitive regarding those gridstopper-values.  
It all depends on the whole amp/circuit/speakers/etc.  
 
Hope this helps,  
 
Chris  
Love, peace & loudness  
http://www.CMWamps.com
 
7/29/2005 8:51 PM
Joe N.

1.5K is common so is 2.2K, or 4.7K, 5.6K in marshalls. Mesa sometimes uses 220K. You see amps with all sorts of values if any. I think that this is an example of a case where a standard has been set, and lasted with no real argument or reasoning behind it, other than higher value = less chance of parasitic oscillations. R. Aiken suggests that you can use a value between 56K-100K without any real attenuation of high frequencies. To each his own i say.  
Joe N.
 

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