I've become somewhat interested in AM again, had been using my T-4XB on 40M, no 
issues.  Curious how my T-4X would work on AM, swapped it with the T-4XB.  
While the T-4X works fine on CW and SSB, on AM, keying the microphone causes 
the plate current to go to maximum regardless of drive setting. 

  

I'm inclined to begin by changing out V11, the 6AU6A AM modulator tube.  
Thoughts? 



73, Curt KB5JO
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