[Amps] AL-80B Trouble

[Scott Manthe]

Rich,
Hundreds of empirical observations from all makes of amplifiers must be 
wrong. Clearly, the problems must be the mysterious parasitic 
oscillation, which obviously is pushing the filament sideways. Thank God 
I'm not an expert, so I don't have to debate you on this very tired and 
worn-out subject. Please feel free to tell Mike your interpretation of 
his problem- we are all waiting with bated breath.

73,
Scott, N9AA

R L Measures wrote:
>
> On Aug 25, 2006, at 9:30 AM, Scott Manthe wrote:
>
>> This seems to be a very common occurrence in later Amperex tubes. The
>> tube is at fault, not the amp
>
> I do not agree, Scott.  New Amperex tubes typically have a 
> grid-filament potential withstanding ability of > 8kV, and a short is 
> not going to occur unless some anomaly pushes the filament sideways, 
> causing it to touch the grid.
>
>