Although this set is very rare in its own right (probably only 2 or 3 left in existence), the real draw is the 20BP4 CRT, which I will transfer to my Westminster soon. Then the 19DP4 sub which is the Westminster will find its way into this set.
The 20BP4, with its very low deflection angle, Pyrex envelope, Frankenstein-type anode connection, and highly convex screen is quite a thing to behold:
Here's a closeup of the label:
Although a lot of DuMont stuff is really high quality. This particular CRT doesn't quite fit DuMont's "First with the Finest..." motto. These glass bubbles in the screen are pretty big, and very noticeable when viewing the set:
I'm also curious as to whether this might be a rebuilt CRT. Since the 20BP4 has a Pyrex envelope, most CRT rebuilders would not have been able to rebuild this tube. Maybe it went back to the DuMont factory? The reason I'm curious is the green glass joint visible in the neck of this tube. An earlier (gone to air) 20BP4 I used to have (the one that came with my Westminster) didn't have anything like this. I wonder if this is a soft glass neck joined to a Pyrex funnel? The green glass might be a matching glass to join the two together. Also note in the label picture above, there appears to be a shadow of an old label, along with the new label, both apparently done by the DuMont factory. Did DuMont do their own rebuilds? Or was this one rebuilt in its original production (failed some test when first built, and was then reworked)?
