3 thoughts on “24a tetrode curves”

  1. Hi Ale. Thanks for the curves. I want to see THD. In particular, the output level of ~ 100 volts for use with lamp 6S4S. Thank you.
    Svetlana.

    1. Hi Svetlana. Unfortunately one of the valves I got looks like has some intermittent failure. Not sure if it’s the socket.

      I will have to build a screen regulator as don’t have a second power supply for this. The screen regulator will be fed from the anode. Probably a simple resistor divider (e.g. potentiometer) and a source follower.

      Are you looking to run this valve with screen at +90V?
      For 100Vpp and some additional headroom, I will be looking at biasing this at 250V anode voltage at least, what do you think?
      Ale

  2. Hi Ale. I badly translated what you wrote.I’ll try to write this .I want to see not only the THD 22.22dBu ( 10 Vrms) and 31.249dBu (28.284Vrms).
    Svetlana

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