Elevated Heater & B+ Voltage

[John Caswell]

Hi all,
All valves have a specified maximum voltage heater to cathode voltage both +ve and -ve so try not to exceed this.
In an SRPP or cascode circuit where one valve sits upon another, some juggling of the "stand off" voltage may be required to make sure both sections of the valve do not exceed this voltage.
Simplest way is to stick a 500K pot across HT and ground with the wiper to the isolated heater supply and adjust for best results and voltages.
John