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Sprich in meinem Anwendungsfall sprich nichts dagegen die EF83 auszuprobieren, richtig?
Hmm... bias reads double - normally around 2.25V with the EF86 - now around 4.5V. This means the current has essentially doubled. Checking the plate resistor - it is now dropping double it was before. So instead of 120V on the plate, I now had 60... simple Ohms law.