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RE: Phase Inverter Bias Voltage

Posted by dave slagle (M) on January 18, 2017 at 10:55:54

In Reply to: RE: Phase Inverter Bias Voltage posted by sony6060 on January 18, 2017 at 08:04:10:

Tubes amplify the difference between the grid and the cathode and since the grid is grounded the signal must appear at the cathode in order for that section to amplify. Luckily there is an inverted signal appearing at the other tube sections cathode and in order to keep from attenuating it you need as high an impedance as possible from both cathodes to ground. The sole reason there is a - supply is to make the cathode resistor as large as possible and still be able to pass the plate current. If no negative supply is available some have had good results from using a choke or taken to the extreme a CCS can be used.

dave

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