[Amps] AL-80B Trouble

[R L Measures]

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.

> - replace the tube and you'll likely get
> good service from the amp.
>
> 73,
> Scott, N9AA
>
> Mike Schlamp wrote:
>>       HELP: Is my assumption too far fetched?  If the tube is  
>> shorted, what could have  happened to cause this, considering the  
>> tube is only 3yrs of age?  My fear is if I just replace the tube,  
>> I will  end up back to square one over time.  Is  there any  
>> trouble shooting guide regarding the Amp?  I am looking for a  
>> document or notes  indicating voltages, along with tips of what to  
>> look for.
>>
>>       Thank you,
>>
>>       Mike
>>       W5CUL
>>
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R L MEASURES, AG6K. 805-386-3734
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