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The 48 and 49 models have the two IF stage design(with no RF amplifier). The 46 designs that I have all have a 7C7 RF amplifier, 7A8, pentagrid converter, and 7B7 IF amplifier. They also have only two gang tuning caps, just as the 48/49 models have.
I do have one Hippo that must have been the super-deluxe model. It has white knobs, not red ones. The station display is also slightly different. It has a painted white case. The other colors I have are unpainted brown(with red knobs) and unpainted black(with black knobs).
Both designs seem to work well. I can pick up the only AM station that I like listening to on either design. The station is 60 miles away and I have some trouble picking it up on tube radios without an RF amp or dual IF stage.
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