The tube arrived in the post today. Plugged it into the base and........... it works.
Was hoping for something more exciting I suppose. Just bought a $300 amp for $60.
The volume potentiometer is bad though and a few others too so I'll replace them in time.
A pic of the two tubes. The pink Lines mark points in the Glass where a blackening is on the old but not the new. They are both 12ax7 tubes.
thanks for watching