@pieper1973
The 250 V is not a āproblemā. The OEM caps are only 100 V. But as @tomthiel explained, the higher voltage caps have thicker film which is desirable. So, a 250 V PUR would almost certainly sound way better than the OEM 100 V Solens or CYCs. But even better performance is possible with 400 V and 630 V versions. I heard an improvement with 250 V over 160 V CSAs on the woofer boards, and those are shunts, not direct feeds. It wasnāt a huge difference, and I told Tom I could understand a manufacturer going with the 160 V to meet a price point, but I was willing to pay for the improvement.
In my communications with Rob Gillum, he seemed lukewarm around my upgrade project. I suspect his stock is limited to SA at 630 V (I might be wrong!). One clue is that Thiel only built ~200 out of a planned 300 pairs of CS2.4 SE. Those SAs will certainly improve the sonics of the original CS2.4, even more so if you have boards sourced from FST with the CYC polyester caps. But a DIYer can do even better in 2022.