Transition Frequency of ECC83 triodes - does anyone have Experimental results?

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tomasz1000

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If you do, please tell me what fT you measured vs what anode voltage.
 

I have not tested ECC83 at a high frequency but ECC 81 being similar can oscillate at more than 500 MHz. I never tried to vary the anode voltage, so you should run a test.
 

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