High voltage delay for Kaiju?

[Pandymonium]

My rudimentary understanding of the Kaiju power supply is that high voltage appears on the plates before the cathodes are heated/ready to conduct. If this is correct, could I incorporate this high voltage delay into the Kaiju to delay high voltage to the plates? Thank you.

 

[Paul Birkeland]

A 300B will conduct fully within a few seconds of the power switch being thrown. The Kaiju soft start driver board also holds the voltage present at the 5670 plate pins down pretty low to protect that tube, so I would question whether the perceived benefit of adding something like this would outweigh the complication/potential reliability issues.

 

[Paul Joppa]

Not advisable. The Kaiju peak voltage at startup can exceed the maximum rating of the delay, and the Kaiju power supply is a voltage doubler, which needs a different circuit that can switch AC not DC, i.e. a toggle switch or a relay. There are terminals on the power supply PC board for this.

But the Kaiju driver circuit already incorporates a time delay for the driver HV, which also keeps the 300B grid from seeing any positive voltage during startup and protects the 300B in a manner similar to a HV delay. It also eliminates the "thump" by turning on slowly.

 

[Pandymonium]

Thank you both. That's the information that I was looking for.