Amperex "Bugle Boy" tube compatibility

No.
12AX7/ECC83 has very different pin out from any of those tubes you have named that are said to be compatible with the 6N11. Things equal to the same thing are equal to each other. Things not equal to the same thing won’t work. Furthermore, the electrical characteristics of a 12AX7 are also very very different from any of the tubes you listed. In other words, you would not want to replace a 6N11 with a 12AX7, even if you could.

From your description,  No.  The E88CC, 6DJ8 family of tubes are 6 volt tubes and the 12AX7 are 12 volt.  It shouldn't be hard  to find tubes of the E88CC, 6DJ8 family.

Actually you can run a 12AX7 with a 6V filament supply. In this case it would only require some re-wiring of the tube socket. But that’s the least of the reasons why not to do it.

@lewm 

Actually you can run a 12AX7 with a 6V filament supply. In this case it would only require some re-wiring of the tube socket. But that’s the least of the reasons why not to do it.

This post is irresponsible. If someone reads the first sentence, and omits to read the second, they could potantially damage their amplifier.

Given that you yourself often fail to read posts properly I do not understand why you would not be more mindful of the ramifications or consequences of your posts.