Finally got around to trying the Sylvania 5933. I can characterize these as soft and warm. I've tried 5 different input tubes and while all of them sounded different in terms of bass, soundstage, highs, etc. But in all cases there is a lack of detail and a pleasant warmth. I could also not get any better than fat bass. After the tight bass of the 6bg6 it's tough to live with flabby bass.
These particular 5933 tubes are from Vintage Tube Services so I know they are in great shape. They did come in the old green Sylvania boxes though. I do have some gold brand 5933 which are newer but I'm not sure when I'll get around to trying them.
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