Re: "Burning - in" Double Triodes
When I did tests on ECC81's for use as a standard valve for my AVO VCM, I took the test parameters from the Avo databook and worked around those.
In this case, the VCM tests at Va=250 and Vg=-2 and Gm should be around 5.5mA/V
So with Va fixed at 250, I varied Vg from -2.2 though -1.8 while measuring Ia, and the plot typically looks like the one attached. In this particular case Gm was measured at 5.1 and 5.3 over two runs, averaging ~5.2mA/V.
B
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