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Seems like the KBG has issues...

So, the leads aren't welded? It sounds as though the 10V is required in order to overcome contact potential. With or without bias, contact potential has the potential to create sonic coloration and ambiguity.

Then there's this:

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

That's a very small margin for an audio coupling cap, particularly in the region of 100 - 400 Hz.

If any of this information is correct, I wouldn't even consider using these in the signal path.




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