Problems with realjazzcat are numerous. He's been known to buy cheap tubes, goldplate their pins, and resell them as something they aren't. He will use "original boxes" as props: sometimes the boxes aren't included but are pictured in the auction to drive up the value, while other times the boxes aren't even the correct ones for the tube (wrong vintage, missing flaps with identification, etc.). Notice he only does private auctions these days? He used to do public auctions, but people noticed a trend of the same folks bidding and driving up prices. There's no concrete proof, but shill bidding is a very real possibility. His tubes almost always fetch well above normal market value.
As for the "CCa" he has for auction, it might not even be a CCa (it probably is not). The gold (possibly copper) grid posts is no positive identification as he claims it is. I've had many TFK CCas, E188CC, and E88CC .... the grid post material varies based on vintage, not specific to one designation. As you can see, the tube has no remaining prints left on the glass; realjazzcat basically marketed it as a CCa because CCas fetch far more money.
In all fairness, *some* of the tubes he sells are legit. Consider bidding on his auctions with extreme caution.
Siemens issued many CCa, with the late 50s (exceedingly rare) and early 60s being regarded as the best. I much prefer the Siemens over the Telefunken, but your mileage may vary.
