Well it was a long day of working on the amp yesterday. I intended to post this update last night but it was 11:30pm when I gave up and went to bed.
I got the entire amp wired up, switched it on.... No smoke, fire, sparks. Okay that's good.
The valves warm up nicely and a horrendous hum develops. Ahhh @#*@*##*!
After plenty head scratching I disconnected the base and treble pots, and used a single ECC83 to the volume controls.
Less of a hum, that's good. Not good...