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I don't contest that

Posted by Ralph on January 29, 2025 at 08:39:52:
I didn't say anything about how the caps sound. We've tested them a lot over the last 25 years. About half of them we tested exhibited some electrical leakage.

So IMO while your example is likely real, the question is 'for how long?'

The original Vitamin Q capacitors are quite old. I hope this isn't what you have in your line stage; I regard them as untrustworthy.

BTW, FWIW, what we've seen of coupling capacitors over the years suggests that bypassing an audio coupling capacitor is a bad move as it smears the sound (the smaller cap usually is much 'faster' than the larger cap). Better to just give it your best shot with the coupling cap and put in the best one you can get.