Which grid?
If G1 volts are higher (more negative) than intended, with respect to cathode, then the anode is pushed closer to cutoff.
I.e. anode volt rise above the intended point.
If G1 volts are higher (more negative) than intended, with respect to cathode, then the anode is pushed closer to cutoff.
I.e. anode volt rise above the intended point.
Do you mean screen ( g2) voltage ?
If the screens draw to much current they risk deformation with reduced
function and finally shorts.
Draw the schematic with voltages, including cathode, control grid, screen grid, and plate, as well as the B+ filters and resistors.
Are you using fixed bias?
What is the control grid voltage?
Are you using self bias?
What is the cathode voltage?
Is there a resistor that drops B+ voltage to the screen?
What is the B+ voltage at that end of the resistor?
What is the resistance of the resistor?
Are you using fixed bias?
What is the control grid voltage?
Are you using self bias?
What is the cathode voltage?
Is there a resistor that drops B+ voltage to the screen?
What is the B+ voltage at that end of the resistor?
What is the resistance of the resistor?
A screen stopper of a few hundred ohms mounted at the socket
Here it is basicly.
I have zeners so it should give around 300v,but it accidently run hot once at now it gives 350v.
Maybe I could use a resistor between The mosfet and the grid. 🙂
might be a simple saver for the tube.
I have today tested with a resistor between The mosfet and Grid 2 so that I have 280v.
Is that close enough or should I go higher?
Is that close enough or should I go higher?
If sound is acceptable then it seems to be a good solution.
Weakaning the screen supply will compress the (plate) negative periods,
my guess is that it will increase 2'nd somewhat. But if it's audiable i don't know.