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In Reply to: RE: Let's start with mica capacitors posted by sser2 on April 25, 2017 at 16:19:03
These are uniquely Russian, no Western analogs.K75 were designed to improve electrical characteristics and reliability of paper capacitors. They have two layers of dielectric: mylar and oil-impregnated paper. Most have metallization electrodes, but some have foils. They have temperature rating of 125C.
K75-10, K75-24. AC-rated metallized film capacitors in sealed steel cases. They are primarily intended for 50 Hz AC, but, unlike Western motor run capacitors, have useful frequency range up to 10 kHz, enabling their use as superb power supply filter capacitors.
K75-12. Foil capacitors similar in design to K40Y-9, and recommended for coupling duty.
K75-15. Foil, rated in kilovolt range DC. Very good for high voltage power supply.
K75-22. Foil capacitors rated for kilovolt AC.
K75-11, 17, 40. Impulse duty capacitors designed to maximize stored energy and peak discharge current. Rumors have it that they were used in nuclear weapon triggers.
K75-47. Capacitors in epoxy body. All other K75s are in tightly sealed steel bodies.
Edits: 05/02/17Follow Ups:
sser2 More good info, however a couple of discrepancies. You state K75-10, K75-24 are metallized film, then the next section down you state k75-12, k75-24 are foil capacitors similar to K40Y-9. The k75-24 seem to be both metallized, and foil?? Also if the k75-24 are similar in design to the K40Y-9 does that mean they don't have a hybrid dielectric, but rather paper?Also I've searched ebay for K75-40 and found these monsters (link below). They seem to be in metal cases, not epoxy. The only other example I could find were rated at 20uf 2000V, and they appeared to have metal cases.
Not trying to pick nits here, just trying to demystify the Russian caps.
twystd
Edits: 04/28/17
Thanks for pointing to discrepancies.Only K75-12 is foil. It is similar to K40Y-9 in case construction, foil electrodes, and oil impregnation, but K40Y-9 has 100% paper dielectric, whereas K75-12 has hybrid dielectric.
Epoxy body is K75-47. K75-40 is one of the impulse types.
Edits: 05/02/17
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