[Allen in SB]

I’m considering buying a Model 90 cathedral that is missing the large 3-tube tube shield. Philco made three versions of this model with different output tubes (early w/ two 45s; mid w/ one 47; and late w/ two 47s). “My” radio is the mid version. Does anyone know if the large tube shields for these three models are interchangeable? The early and mid versions appear to have the same tubes and tube layout for the tubes in the large tube shield (24, 27 and 24). The late version appears to have different tubes and a different tube layout. Therefore, perhaps the early and mid versions are interchangeable.

Additionally, the radio has a vertical bracket on the opposite side between the rectifier (80) and output tube (47). You can see the bracket in this video (5 minutes into video): http://www.youtube.com/watch?v=ptQ2d0VsZmc Does anyone know the purpose of this bracket? Another tube shield?

Thanks!