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It is known that Dumont had different envelopes for one of their 15" tubes with the same number.
I recently had a Dumont 12qp4 with a different anode connector than the
Dumont ball -- it had the 12lp4 type cup. It was an etched Dumont but
was a rebuild.
I think the yoke mount in both pics shown has 2 sets of mounting holes, with slot.
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