Warm sounding 6922 Type Tubes

I guess I missed it: What's a "CCA"?

@newbee As you recommended, I installed a JJ and it sounds better the Mullards. It removed the piercing extended highs but the overall sound is just as good as the Mullards. It has a nice soundstage and the bass is well defined. Who would have thought a cheap tube would sound this good. Thanks Ron 

What’s a "CCA"?

this is an old stock euro grading of top tier 6dj8/ecc88 type tubes, usually seen in french dutch and german made tubes

these are very rare these days and command very high prices due mostly to their rarity (they sound very nice but not materially better than ’plain jane’ tubes from the period, so long as the latter are well matched and tested)

but if you want a pair of tubes that cost as much as your linestage, then these are the ones to get 🤣

Thanks @jjss49. I assume Telefunken was one company that made them?

Yes @bdp24 -  Siemens and Telefunken made them for the German communications industry. 

CCa tubes are not a sure thing though.  Later vintage Siemens are known to be bright sounding and I don't think the Telefunkens are as highly regarded as the Siemens.  So as with all things tube related, do your homework.