21-10-2022, 02:46 PM
Hi Adrain
The 10.5V is just measured across the 2 resistors but there is D4 between the resistors and the cathode of the valve. Is D4 a Zener? If so the negative grid voltage will be the 3.2V + whatever the zener voltage is.
Frank
The 10.5V is just measured across the 2 resistors but there is D4 between the resistors and the cathode of the valve. Is D4 a Zener? If so the negative grid voltage will be the 3.2V + whatever the zener voltage is.
Frank
