From: ruffrecords@yahoo.com   
      
   I am having a strange problem with what appears to be distortion due to grid   
   current in a 12AX7.   
   It's a CC stage with a 3K Rk bypassed about 120K in the plate and a 300V   
   supply. Anode sits at just   
   over 200V and cathode just below 2V.   
      
   I would not expect to see any distortion due to grid current with an input   
   signal of 250mV rms at   
   2KHz but I do. There's a 1Meg from grid to ground and the test oscillator is   
   fed to the grid via a   
   100K resistor. Analyzer  is connected across grid to gnd. Tube off, there is   
   no distortion with the   
   100K in cct or shorted. Tube powered up I get about -33dB 2H measured at the   
   grid, -39dB 3H, -59dB 4H.   
      
   Short the 100K and the 2H drops to to below -70dB.   
      
   I tried changing the tube but the result is the same. What is going on?   
      
   Cheers   
      
   Ian   
      
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