12AU7/ECC82

       Rp = 0.047 MOhm       Rg = 0.15 MOhm       Rk = 1.2 kOhm

  Ebb (V)     Ip(mA)      Eo (Veff)[6]  Gain   % Distortion [7]
  100          1.20          11         13.5       5.6
  150          1.82          18         13.5       6.1
  200          2.41          26         13.5       6.3
  250          3.02          34         13.5       6.4
  300          3.65          43         13.S       6.5
  350          4 30          51         13.5       6.6
  400          5.00          59         13.5       6.7
 

       Rp = 0.1  MOhm       Rg = 0.33 MOhm       Rk = 2.2 kOhm

  Ebb (V)     Ip(mA)      Eo (Veff)[6]  Gain   % Distortion [7]
  100          0.66          10          14        4.8
  150          0.98          17          14        5.6
  200          1.30          25          14        5.8
  250          1.63          32          14        5.9
  300          1.97          41          14        6.0
  350          2.30          49          14        6.1
  400          2 62          57          14        6.2


       Rp = 0.22 MOhm       Rg = 0.68 MOhm       Rk = 3.9 kOhm

  Ebb (V)     Ip(mA)      Eo (Veff)[6]  Gain   % Distortion [7]
  100          0.33           8         14.5       4.0
  150          0.50          15         14.5       4.4
  200          0.66          22         14.5       4.7
  250          0.82          28         14.5       4.8
  300          0.98          36         14.5       4.9
  350          1.16          43         14.5       5.0
  400          1.31          50         14.5       5.1


[6] Grid current = +0.3 uA
[7] Approximately proportional to the output voltage