For those who are interested I have just finished a power supply for my
4CX250B linear and it has a total of 5 relays in the control scheme.
The relays are:
1. Remote power supply on.
2. Filament warm up timer.
3. High voltage primary power.
4. Primary resistor current limit resistors cutout.
5: Screen voltage to high voltage interlock.
The power switch in the linear only handles the current of the 12 volt
Power supply has a local/remote switch for power on.
Screen supply is 350 volts regulated by zener diodes.
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