The values of the screen voltages are just a quick way to tell if any of the screen resistors are blown.
The main supply voltages will change a bit as you alter the idle current. If you checked the plate voltages you would see the same, it drops as the idle current increases. This is due to the loading of the supply.
The main supply voltages will change a bit as you alter the idle current. If you checked the plate voltages you would see the same, it drops as the idle current increases. This is due to the loading of the supply.
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