Tube DIY Asylum

Because signal voltage is low,

128.125.179.129

In Reply to: RE: 12AX7A contact-potential biasing posted by Eli Duttman on May 11, 2008 at 17:27:58

(3-5 mV), and grid resistance at very low positive grid potential is high, the grid is practically not conducting, so this is not Class A2. The graph of grid current vs. positive grid potential looks like two lines nearly parallel Y and X axes, with a knee in the corner. Zero bias for low signal stages is quite common and often suggested as a typical operating condition in tube data sheets.

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