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RE: Phase Inverter Bias Voltage

Posted by Paul Joppa (P) on January 17, 2017 at 13:42:56

In Reply to: Phase Inverter Bias Voltage posted by sony6060 on January 17, 2017 at 10:36:22:

That resistor sets the current of the LTP - in this case, 140v/25.5K is 5.5mA, or 2.75mA per triode. Decreasing the resistance will increase the current; the 60K plate resistors would need to be adjusted in proportion to maintain the same plate voltage.

In the diagram, the driver is running 130v at 2.75mA; the spec sheet example is 150v at 8.2mA per triode. So there is plenty of room for increasing the driver current.

While there are technical effects, they are small enough that I would expect listening to be a more reliable guide. It's an easy experiment, only three resistors to change. Try it and see!

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