I just picked up a matched NOS set of Telefunkens from Brent Jessee. Not the expensive 6922, but the slightly more affordable 6DJ8 / ECC88 Telefunken West Germany with diamond mark. GM: 10,500/10,000 10,500/10,000. They are still breaking-in I have about 20-hours on them.
So far they have been very quite. These tubes are fast and very detailed with a lot of air around the instruments. Piano is really sweet sounding standout on these Telefunkens. Their tonality is neutral in the bass and midrange to slightly bright in the highs, but not overly bright. They seem to pair well with my Grado PS-500 more so than my AKG K702s.
I’m hoping the highs will mellow just a bit with a 100-hours on them, but they are very nice right out of the box. If you are looking for maximum detail, neutrality, and air, then these Telefunkens are worth considering. If you want the classic tube warmth, then I would suggest you look elsewhere.