[AMPS] Grid protection

[measures]

>
>> 
>> I recommended removing the CE shorted transistor and replacing it with a
>> fuse resistor.   Shorted transistors can not limit current.  
>> 
>> end 
>> 
>> -  Rich..., 805.386.3734, www.vcnet.com/measures.  
>
>The problems with that are:
>
>1.) You recommended it as a blanket cure in QST
>
A fuse is a blanket cure for CE shorted transistors.  

>2.) A fuse resistor is a very slow acting device, even a regular fuse 
>is unreliable
>
CE shorted transistors never unshort.   If anything, fuses open too soon. 
 

>3.) If the grid resistor opens, the tube can go into current run away 
>under some conditions
>
With no current path to the neg. HV return?
>
cheers, Tom

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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