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Any sustitute for a 6az8?

Posted by MIrving on July 24, 2007 at 06:03:03:
Hello
I am in the process of upgrading a Knight KU-45 Miltiples amp and need some help. In the multiplex circuit there is a 12AT7 and a 6AZ8 tube. The 6AZ8 is an odd duck and I am looking for any possible sub. ON the schematic that I was generously sent to me by a fine gentleman in a prior post by me looking for a schematic. It says the 6AZ8 is the cathode follow driver from the 12AX7? Any help or possible tube substituions would be appreciated.
Thanks
Mike