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From Russian tube DIY forums and data sheets

"Good in sound".
"KBG-M2 are very good capacitors. I use them in most of my projects. BTW, K40-Y9 I like much less".

From specification sheets of Russian PIO capacitors:

KBG maximum temperature - 70 degrees centigrade.
K40Y maximum temperature - 130 degrees centigrade.
Apparently, they use very different dielectric materials.

Basic KBG dielectric material: condenser paper 8 or 10 micron thick.
200V - 2 layers 8 micron
400V - 3 layers 8 micron
600V - 3 layers 10 micron
1000V - 4 layers 10 micron
1500V - 5 layers 10 micron
Impregnation medium - petroleum jelly.

KBG capacitor AC component should not exceed:
20% working voltage at 50 Hz
15% 100 Hz
10% 400 Hz
5% 1 KHz
2% 10 KHz

The foils of Russian KBG capacitors are not welded or soldered to leads, therefore they should not be used at very low voltages. Biasing voltage of at least 10 V should be present when these capacitors are used for coupling duty.


Edits: 04/22/17 04/22/17
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