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In Reply to: RE: KT120 Spotty Plates posted by jupiterboy on February 03, 2015 at 11:05:20
I must correct. The only thing that should be emitting electrons is the cathode. The plate/anode is drawing them - they sometimes bounce off, but they come back to the plate. The plates are coated with graphite in order to increase surface area, thus dissipation.
That said, if it's flaking off, it probably means there are/were impurities/residue between the nickel anode and the graphite. So, I imagine something heating, boiling, evaporating, lifting, and donezo.
Is there a year and month indicated on the tube?
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May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
Follow Ups:
Thanks for clarifying my misrepresentation of the technology. I think you are right about the contamination. I'm going to the importer.
No prob :) That kind of wearing merits a replacement, for sure! I hope it pans out.
And ya, what are the date codes on the tubes? It may serve to help others :)
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May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
I'll check and post, however, I exchanged emails with the US importer who told me that this happens when cleaning the plates, that it is common, and if I had a big batch to examine I would notice it more often. He says it does not effect the performance.
Seems odd to me. I'll post the dates when I check.
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