• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

EL300 = 6FN5 / PL300 = 35FN5 tube

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The data sheet does not tell anything above 200 Vanode and only for 3 screen values, I fear that extrapolation be very approximate !

If you aren't lazy, 2 adjustable power supplies and 3 DVM is just what you need to measure . . . along with pen and paper . . . or a calc sheet 😎
 
Tadaaa!

Left most curve is 0V, from there on i used 5V increments.
Dissipation curve drawn is for 22,6 W (17,6+5) but I believe this tube can handle some more...

Now how do I calculate mu, rp, ideal plate load etc?
 

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