Electric 300B (white porcelain gold pin), egg-shaped graphite anode! Hook filament, gift box packaging (1pair), factory paired, it is a Full music model and has been highly rated as the perfect 300B by foreign audio magazines multiple times.

Used only a few times and practically new!

Normal retail is $850 a pair. I have an extra piece of this 300B tube (with original box) that can be purchased for $250 extra.

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