Tantalum capacitor recognition

Hi all, I am in the process of rebuilding and finalising the choice of replacement capacitors in my naim 32.5 pre amps and wondered if anyone knows what these little dark Orange Tants might be ? They measure lower ESR than Kemet 356 and the old used Panasonic blues, and they sound the best doing A-B, I even checked by swapping them from one board to another (Thankfully naim don't bend the legs to make removal more difficult !)

All 10uf 25V, Any ideas ? the Panasonic Blues measure 10-11uf and ESR of 600-700, the new Kemet's 9.5-10uf and ESR of 600-650 and the Orange 10-10.5uf and 500-550 ESR, but they sound better than the others doing A-B tests

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John, hi

They sound different, and as importantly seems they do degrade in some way as I have a number of boards where the ESR on caps 30 years old vary significantly

I’ve read many times that tants work or short but I have a bunch on different boards that measure between 0.9 Ohms and 11 Ohms ESR !

They all worked but certainly didn’t sound the same
 
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