[AMPS] AL-82

[Rich Measures]

>
>Replaced the diode on circuit board, it was on schematic, and was bad.
>Replaced with a IN4141 because that was all I had. No difference in the
>wild red glowing of plates.
>
>Checked zener diodes in center tap of filament transformer.  Red lead of
>meter to threaded post of zener diode #1 .559 mega ohms.  Reversing leads
>1.35 mega ohms.
>
>Zener #2 red lead of VOM to threaded post 1.4 mega ohms.  Reverersing
>leads, 14.1 mega ohms.
>
>Running amp with zeners disconnected, still big red glow and 300 ma on
>plate current meter.
>
€  Could be a grid/fil. short.   On page 15 of the Sept., 1990 issue of 
*QST* Magazine, there is a photograph of the insides of a3-500Z with a 
grid/fil. short.    //   If the grid/fil. potential measures 0v on 
standby, you have a grid/fil. shorted tube.  //  There is a photo of a 
parasite-arced AL-82 bandswitch on my Web site.   


Rich...

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


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