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I have a 304H manual here in my library, it shows a 5CP-
The 2 304H scopes I have worked on in the past both used 5CP- tubes.
I have a Rider Encyclopedia on Oscilloscopes, and the 304H schematic shows a 5CP-
A Google search for DuMont 304H schematics shows 2 separate copies of the schematic, both showing 5CP- tubes.
I can't find a single reference to a 5ADP- in a 304H, besides your posts about this on various forums over the years.
All this would lead one to believe that the 5ADP- is NOT original to your scope, and coupled with the differences in gun voltage requirements and the fact that your scope works properly when you try a 5CP- in it would seem to make the conclusion obvious.
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