Uberschall with 6ca7 = Win

A question about the cab/mic'ing. Could you describe the position of the mic? Did you post process the signal? Looking at it through the meters and seeing something I've never seen out of V30s. :) Or... maybe on Liquid Tension Acid Rain.
 
I was under the impression that 6CA7 is simply the American name for an EL34?

As I recall, the 6CA7 was the American electronic equivalent to the EL-34, but the construction was not entirely the same as the European EL-34. It consisted of some design features similar to the 6L6 giving it sonic characteristics like a cross between an EL-34 and a 6L6.