Prototype set is here

[jeyurkon]

If I understand the shunt regulator circuit, if the convergence grid draws more current that will shift the grid on the shunt regulator more negative allowing the HV to rise as you observed.

To minimize the effect the standing current in the divider would need to be larger, meaning a beefier supply. Otherwise you need to limit the convergence grid current, but then you won't have sufficient voltage for convergence.

John

Originally Posted by miniman82

If it were drawing an amount of current that was too much to handle, anode voltage would have sagged- instead it got higher. Only testing with the modified chassis will prove anything, Ed says the metal tubes were electrically identical to the glass ones...