[AdrianH]

6AU6 or EF94, it's just I have the 91's to hand. I am not sure on gain, until I get the output transformer in place and test final voltage swing then it is difficult to say how I am doing. I have wired onto the grid resistors of the TT15 and with a 60mV p-p signal I am getting a 50 Volt p - p signal on the grids. But there will be some negative feedback added when the transformer is in place.

I am just playing try it and see but making a note of what others say as potential solutions.

Thanks for the offer.

Adrian