I have some 10µF / 400V K75-24 tub caps for a tube amp power supply.
They are described as having a hybrid dielectric of paper and plastic, with some sources saying it's dry, and some saying it's impregnated with oil. What does this hybrid dielectric mean in practice? Is it paper towards one electrode and plastic towards the other? Are they somehow diffused? What is the benefit to a hybrid dielectric? The caps are completely non-polar.
They're really good caps though, I found out.
They are described as having a hybrid dielectric of paper and plastic, with some sources saying it's dry, and some saying it's impregnated with oil. What does this hybrid dielectric mean in practice? Is it paper towards one electrode and plastic towards the other? Are they somehow diffused? What is the benefit to a hybrid dielectric? The caps are completely non-polar.
They're really good caps though, I found out.
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I have never seen this type without the military rhombus printed on them, but who knows, they may just be for motor run. I think I read somewhere that they were very low inductance. I always use them for local power supply decoupling. Type K75-10-which look similar, but bigger- always have AC ratings printed on the body. (curiously, they say 50Hz, so perhaps connected live to neutral, or just across xformer secondary)
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Only information regarding "hybrid capacitor dielectric" is about some kinds of electrolytic caps. Nothing about combining two film type dielectrics.
I am puzzled.
They are a bit bigger than comparable russian 400V plastic film only, yet much smaller than comparable true PIO types.
I am puzzled.
They are a bit bigger than comparable russian 400V plastic film only, yet much smaller than comparable true PIO types.
It depends what people mean with mixed...
The famous Siemens MKV capaciter (later on S+M and after that Epcos) used a double side metalised paperfoil with a pp (polypropyleen) dielectricum. ITT and Icar used simular techniques (not always double sided alu paper foil)
I also have some Jensen with the text " mixed" dielectricum on it. Jensen say: "Electrodes of aluminium foil and mixed paper/polypropylene dielectric, mineral oil impregnated (non PCB)"
The famous Siemens MKV capaciter (later on S+M and after that Epcos) used a double side metalised paperfoil with a pp (polypropyleen) dielectricum. ITT and Icar used simular techniques (not always double sided alu paper foil)
I also have some Jensen with the text " mixed" dielectricum on it. Jensen say: "Electrodes of aluminium foil and mixed paper/polypropylene dielectric, mineral oil impregnated (non PCB)"
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I agree, so did Allen Wright.
I still have lots of 0,22microF B25834 serie, super quality.
I still have lots of 0,22microF B25834 serie, super quality.
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