[AMPS] knock a 3-500z short loose..?

[measures]

>
>  I have fixed that by discharging about a 1000 ufd cap charged
>to about 15-20 volts between the filament/grid. No promises!
>
The hat trick is to fix it so that the tube does not short when at normal 
operating temp.  To do this, you need a tube that exhibits a cold g/f 
withstanding potential of 6 to 9 kV.  To straighten bent filament 
helices, we apply 10g for 20 - 40 seconds with a fil potential of c. 
5.6v.  

cheers, Mark  WB8JKR
>
>
>On Fri, 31 Dec 1999 10:57:02 -0800 nospam4me@juno.com writes:
>>
>>I've got the source of much trouble here in my hand... a 3-500z with a 
>>cathode to grid short.  Anyone care to suggest a method to possibly 
>>open the short. I won't trust the tube in an amplifier again, except 
>>maybe a
>>construction place holder. 
>>
>>skipp  


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


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