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It is better to keep to one thread per set. It makes it easier to glean service history and related issues that the poster may not realize relate.
Since it is effecting both H and V sync it most likely is a sync separator stage issue (though if if the sync stage is fine and both sweep stages have issues that can cause the same symptoms.
If a tube tests good but is dead in set there is a solid chance the socket may have an open pin....the sockets in predictas have a well earned reputation for failing.
I've got the same chassis on the bench with good horizontal hold but no vertical sync signal reaching the vertical osc. New caps and couplates in mine. I haven't had much bench time lately...
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