[AMPS] parasitics

[measures@vc.net (Rich Measures)]

To: <amps@contesting.com>
>> Date:          Wed, 20 May 1998 18:16:48 +0100
>> From:          Peter Chadwick <Peter_Chadwick@mitel.com>
>
>> I'd suggest that Rich has presented more than enough evidence to suggest
>> that the answer to 3 is YES.
>
>Anything that causes excess grid current can damage the grid. That 
>includes oscillations as well as fundamental frequency drive...or 
>even dc.
>
>Once the failure happens and the tube is pulled, you have no idea 
>WHAT frequency caused the heat. Just that it happened.
>
What if the gold blisters are only near the grounded end of the grid 
(which is where I typically see them)?  Would DC current be likely to 
cause this?  Would HF current be likely to cause this?


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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