[morzh]

So, I am not sure if you wrote that already, but I have to ask that:

1. Are you sure your output tube is good?
2. Have you really tested the transformer?
3. Are you sure both your speaker's voice and field coils are OK?

I am asking that because without desoldering the secondary of the transformer you do not really know what gives you continuity, voice coil or both coil and secondary (secondary rarely gets the open, it is too thick to burn).

Quick test - desolder the secondary of the output transformer, and connect it to some small speaker. See if you hear anything then, when you touch the grid.