I can see a couple of potential issues:
1. The transformer voltage should be the off-load voltage rather than the rated voltage. If you can't find out from the transformer manufacturer, try taking the rated voltage of 240V and adding around 5%-8%
2. I think 96mA is a very high current draw for a single 6V6 and an EF86, I would be inclined to go for around 50mA in the absence of solid data
Try those and see if the results end up being closer to what you expect.
Regards,
Duncan
