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In Reply to: RE: KBG-MN Incredible as coupling capacitor!!! posted by sser2 on April 22, 2017 at 13:03:39
I'm still stunned by the sound. I've tried some K40's before, but to me the KBG-MN's are better. I have no idea how they are made and what's in them except the paper of course but judging from the sound it has to be gold (just kidding). And they aren't even burned in. I'm extatic. It's like finding a fortune in the dumpster.
Edits: 04/22/17Follow Ups:
I too like the KBG-MNs very very much, pretty unbeatable when you need a parafeed cap. I cut open a 400V 2uf KBG-MN. When I unrolled it I swear it had copper foil. I've heard from others that it just looked that way, but was really aluminum foil. Not so sure, as the cap construction of Russian caps vary.
For example, a K40-Y I cut apart was oil impregnated paper with aluminum foil for the outer 2/3 or so of the winding, the inner 1/3 of the winding was copper foil (with an obvious splice) the copper foil part of the winding used some type of plastic as a dielectric.
twystd
Oil-impregnated Russian capacitor paper is translucent and has reddish brown tint, which may make aluminum look like copper.
KBG-MN are actually big capacitors in rectangular metal cases. What you are talking about is likely axial KBG-M1 or KBG-M2. M1 was superceded by M2 in early 1970s. All M1 and M2 capacitors were made by the OZR factory. I don't know what was the difference between M1 and M2, but it would be interesting to compare them sound wise.
KBG-M2 was discontinued in late 70s (I haven't seen any with dates later than 1979), and replaced with K40. K40-P look much like KBG-M2 - they have one lead connected to the body, and were made by the same factory (OZR). K40-Y have both leads insulated, and they were made by the different factory.
In basic construction they are all the same: aluminum foil electrodes with oil-impregnated paper dielectric. However, technological details such as sources of paper and oil at different factories could have been different.
You might have discovered that there is something special about OZR capacitors...
It IS the big capacitors in rectangular metal cases. They simply shouldn't sound this good. But indeed they do. There has to be some synergies happening with the rest of my gear. It's the only plausible explanation.Update: Tried some other coupling capacitors in the following preamp stage, and there definitely is some synergy involved. The magical combination was and is with KBG-MN and FT-3 teflons. Even a Sprague Vitamin Q or a V-cap Cutf in the latter position can't beat it.
Update II: The KBG-MN's seems to have opened up a little bit with some burn in. Probably much more goodness awaits. Anyhow I changed back to Sprague Vitamin Q in my preamp just to have another listen to this combination of paper oils. I think it sounds great as well. A little warmish perhaps but the midrange is splendid. It's official. KBG-MN IS a great capacitor. Don't let anyone tell you otherwise.
Edits: 04/23/17 04/24/17
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