Thank you both.
So I've learnt something already! The big central contact post in the centre of the valve socket is not as I mistakenly called it the 'centre tap' ....
I can confirm Pin 9 the real tap is free from connection to anything on v1 and v2.
the valves are new, hand picked and matched and these 2 measure 32 ohms across pins 4&5. does that seem ok?
Can you give me any ideas please why would I not see a voltage at pin 4 of v2 if theres 10v going in on pin 5?
many thanks