Price is scary and there's no guarantee the sound will be commensurate. I've purchased many times from that seller on eBay though, so at least there's that .
From my research online, the CV6 is a variant that requires the cap wires be reversed to get sound. I've been tempted to purchase a relatively expensive GEC CV6 from eBay. Roughly $150/pair and have been trying to confirm whether my current adapter will do the job - I ran into some musings...
I just spoke to Laszlo a few days ago requesting TP adapters for the 2C22/7193 tube. I have both the KenRad and National Union. I'm finding them to be just as enjoyable in my system as any other tube. I need the TP adapters to give them a fair fight against my other TPd tubes. I ordered RCA...
At one point, I had 4 Farad Super 3s in my system using custom built DC cables to power various network devices. There was a significant uptick in quality when I added a Sean Jacobs LPS. I've since upgraded that to a Sean Jacobs ARC6 and not looked back.
Almost every non-adapting 5U4G variant I tried was objectively better than the Tak 274B for me simply because of its overly emphasized mids, and artificial tonality across the frequency spectrum that sacrifices transparency. If that's the sound you need based on the context of your current...
PM me. I have non-TP adapters that Laszlo was providing with the PT-14s before they developed the TP adapter design. I have a pair but others have pairs and quads they'd be willing to sell as well. Just know that going the TP adapter route is inevitable;-)