I think the Siemens CCa is the perfect tube, for the CJ's.It is definitely, one of the quietest tubes ever made, and it is extremely transparent. In any well made piece of tube gear, the tube will determine the sound. It's all a matter of personal tastes. I think the Siemens, being on the lighter side of the sonic spectrum, balances out nicely, the CJ's abundance of warmth. This combo, does it for me.
