So I've fitted the Ansar caps in my pre-amp.

Initial impressions were a bit dull and flat compared to the obligatos they have replaced. As implied by others to be fair.

However, I've given them a few more hours (whilst reading up on what coupling caps actually do) and they have really opened up. Not like a tube exactly but the sound has become more focused.

They have added an immediacy and possibly some clarity from what I can tell. A bit like going from tubes to ss.

Happy with my relatively cheap experiment so far.