NIB = New In Box, Brand Spankin New, Never Used, Perfect, etc.....
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Try the Sophia mesh or the JJ mesh; same tubes. They are as good as the current production Western Electrics and are excellent values. Original Western Electrics are simply too much money for a NIB pair in sealed boxes if you can find them .
The Sophia Princess 300b is wonderful and does sound a bit better than standard 300b but at a cost. Different transformers and overall design are required AND they make around 5 watts with a conservative design where they are not overdriven. I am thinking of having an amp built around the Princess as the power is fine for me as I use 96db/8 ohm Galante speakers. Hard to tell if these tubes will be available in a few years as they are not advertised very well other than on the Sophia site.