R. Measures wrote:
>
> On Aug 15, 2005, at 2:04 PM, Steve Thompson wrote:
>
>>
>>> - I have observed that serious parasites in 811s can put so much EMF
>>> on the filament, that it shatters into pieces and falls to the bottom
>>> of the glass envelope.
>>>
>>>
>> Even with the amp in standby?
>
>
> I was not there when it happened, I saw the 3 casualties after a Ham
> brought the AL-811 over for a post mortem. As I recall, he said he
> heard a pop after concluding the power measurement, and the three
> filaments stopped glowing. .
The original post described resistor damage when the amp was in standby
and with no rf applied. In that situation parasitic, or any other,
oscillation seems highly unlikely.
Steve
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