You can try looking at the pin connections underneath the chassis and seeing which pin correlated with which. Use that to make an educated guess weather if the tube belongs there or not.
For an example, is pin 1 and 12 of a socket connected to a 6.3v AC tap on the transformer? Do pins 2, 5, and 10 connect to a B+ in some way?
Use this knowledge and your knowledge of the pinout of the 6K11/6Q11 tube to judge if it belongs in the socket.