[AMPS] Need help with Ameritron AL-80A

[measures]

>Rich,
>
>Thanks for your help.
>
you are welcome.

>1.- Where the 100 ohm supressor resistor should be? I can't locate it.
€  Inside the suppressor inductor.  

>2.- My english is limited. What do you mean with "hot-pot the tube"
€  high-pot means high-potential (voltage) breakdown test.  Leakage 
should be less than 10ua at 8kV. 
 
>3.- What a DMM means?
€  Digital Multi Meter

>BTW: Is the a retrofit-kit for the al-80? 
€ yes

>Might it help  to avoid future
>problems like this
>
€ maybe.  A parasitic suppressor retrofit kit costs $13.50.  It is 
guaranteed to improve stability or it costs you nothing.  
>
cheers, Marcel
>
>
>
>
>>>> measures <2@vc.net> 04/12 8:25 p.m. >>>
>
>>
>>Hi !!
>>
>>I have been using my AL-80A for years without trouble. Sudenly, during
>>last WPX, the amplifier stoped because thes fuse blowed. After restoring
>>
>>the fuse I observed that the 3-500Z showed blue color (gas?) at top, so
>>I replaced the tube as well. 
>
>€  A blue glow On the glass is ok - A blue glow between the anode and the 
>(grounded) grid indicates a bad seal.  .  
>
>>No other symptom and all components seemed
>>to be intact
>>
>>When starting with the new tube i observed the grid current and ip
>>current indicators going full scale when transmiting with very low
>>power. The wattmeter shows normal output power.
>>
>>After looking at the reflector I replaced the 1n4007 diode because it
>>solved the problem when experiencing similar situations. 
>
>€  This suggests that there was some kind of temporary glitch.  
>
>>After this ip
>>current indicator goes full
>>scale even if I don't transmit (Grid meter indicates zero). If I apply
>>normal drive the grid current and ip current indicators go full scale
>>again. The wattmeter shows normal output power.
>>
>>Any idea?
>>
>€  I would:
>1.   test the accuracy of the meters with a DMM.  
>2.  high-pot the tube.  
>3.  measure the actual resistance of the 100-ohm suppressor resistor.  
>
>cheers, Marcel
>>
>>
>>
>>
>>
>>
>>--
>>FAQ on WWW:               http://www.contesting.com/FAQ/amps 
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>>Problems:                 owner-amps@contesting.com 
>>
>>
>
>
>-  Rich..., 805.386.3734, www.vcnet.com/measures.  
>end
>
>
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>FAQ on WWW:               http://www.contesting.com/FAQ/amps 
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>
>


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


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