06-02-2024, 08:07 AM
Hi Greg,
Typically when you see a voltage close to B+ on the plate of a tube there is little or no current flowing in the tube. When no current flows through the tube no voltage drop occurs across the plate load resistor. Voltage drop across the load resistor should be in the 100 - 150 volt range for your tube. If this is the case then either the tube is bad or the grid is biased so high it cuts off current flow.
Typically when you see a voltage close to B+ on the plate of a tube there is little or no current flowing in the tube. When no current flows through the tube no voltage drop occurs across the plate load resistor. Voltage drop across the load resistor should be in the 100 - 150 volt range for your tube. If this is the case then either the tube is bad or the grid is biased so high it cuts off current flow.
