Tube Question for Marik or Bambi...

[kidvybes]

...I know that the GE 5-star 6072 blackplates are excellent low-noise tubes for microphone application, but I was wondering about the "GE 12AT7WA/6201 3-MICA BLACKPLATE" tubes...these seem to be more plentiful and less costly than the 6072's which are becoming more scarce...any input as to the use of these tubes in microphone application?...thanks for your remarks in advance...

For example: http://cgi.ebay.com/GE-12AT7-6201-3...340884760QQcategoryZ38074QQrdZ1QQcmdZViewItem

 

[kidvybes]

...anybody else got any input?...
...or how about 6211 or 5965 GE 5-Star tubes?...Thanks!