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RE: DC 300b amp ,which resistors will need to be adjustable

V3 essentially saturates, with a small positive grid voltage, reduced by the R5/R6 divider. Most of the power supply voltage appears across the cathode resistor R7 so the cathode current is high. The voltage across V3 is small enough that there is no problem with dissipation. The maximum cathode current will probably be exceeded, exhausting the cathode material faster than normal. The voltage across the tube is low enough that the lack of space charge should not result in much cathode stripping.

At least that's how I see it.


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  • RE: DC 300b amp ,which resistors will need to be adjustable - Paul Joppa 21:40:53 08/18/15 (0)

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