Thank you 'tnn' for the information about the speaker. I did not want to fit it into the cabinet without knowing what it was

As my valve amplifier is 25 Watts there should be plenty of headroom. I am making a 2 by 12 combo, the other speaker being a new Celestion Vintage 30. Looking at their frequency responses they 'may' compliment each other, otherwise its out with the wallet to replace the Eminence.