Still wondering if the CPP process can also be used to clean a contaminated tube over time as opposed to just trying to prevent poisoning. I’m wondering about applying a higher power pulse for a short duty cycle so that the CPP goes a little beyond normal operation. A cathode can poison even when the tube is in storage due to impurities in the gas and all cathodes are contaminated in normal operation. Regular CPP process assumes that normal operation of the cathode will drive off any impurities and we all know that in the real world even at nominal currents, cathodes still get contaminated even when we think that all of the digits are being operated.
In the case of a high speed CPP process, a short, higher current pulse of short duration may be able to clean a mild buildup on the cathode surface. Again, all cathodes are contaminated by the operation of another “ON” cathode. Your process does offer an opportunity to sequentially hit each cathode with a pulse that is different than normal operation and may provide a cumulative effect over time to actually clean cathodes without the need for long-term and sustained overdriving of a single cathode. It potentially could be done without a significant impact on the useful life of a tube in normal operation. Rather than thinking of it as prevention, your technique might offer a way to mildly clean and prevent. It actually does look interesting in the video…
Jeff
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