05-11-2016, 02:26 PM
As the valve ages you can run out of emission on the peaks.
You can see the curves at lower anode voltages.
Pentodes (And Tetrodes) are rather different to Triodes due to Vg2, the Screen. A resistor vs low impedance vs transformer tap (ultra linear) makes a big difference for Screen performance.
You want to be above the "knee" or Tetrode Kink (some Pentodes have a slight kink).
You can see the curves at lower anode voltages.
Pentodes (And Tetrodes) are rather different to Triodes due to Vg2, the Screen. A resistor vs low impedance vs transformer tap (ultra linear) makes a big difference for Screen performance.
You want to be above the "knee" or Tetrode Kink (some Pentodes have a slight kink).
