http://forum.audiogon.com/cgi-bin/fr.pl?ymisc&1217698518&read
There are some good comments from several members in this thread.
If you have any experience with German cars, I would characterize the
Siemens CCa as Porsche 911, and Amperex PW 6922 as BMW 540i. Both are fast and precise. The BMW has a certain suppleness that ever-so-slightly smooths rough roads while still providing the driver with excellent road response, while the Porsche transmits the road surface untouched.
Both tubes create very a large image size IMO, larger than any other tube in
the 6DJ8/6922/7308 family, and each takes treble response right up to the
line of being "too much of a good thing" without crossing over the edge. It's
this treble extension that provides the outstanding spatial cues. I believe the
CCa can be too exacting at times, whereas the Amperex are generally more
forgiving...but this is just my opinion in my system.
There are some good comments from several members in this thread.
If you have any experience with German cars, I would characterize the
Siemens CCa as Porsche 911, and Amperex PW 6922 as BMW 540i. Both are fast and precise. The BMW has a certain suppleness that ever-so-slightly smooths rough roads while still providing the driver with excellent road response, while the Porsche transmits the road surface untouched.
Both tubes create very a large image size IMO, larger than any other tube in
the 6DJ8/6922/7308 family, and each takes treble response right up to the
line of being "too much of a good thing" without crossing over the edge. It's
this treble extension that provides the outstanding spatial cues. I believe the
CCa can be too exacting at times, whereas the Amperex are generally more
forgiving...but this is just my opinion in my system.