[Nuvistor]

Has Graham states those voltages look ok although the valves are under run, is it the case of the under run heaters not glowing very brightly and hard to see?

Check the voltages on the anodes of V1and V2 with a high impeadance voltage meter, if the are near correct and the HT to the pre amp is correct, circuit states HT 140v then the valves must be conducting.

Crossed post, OK Lawrence, like minds,