old stock rca 5881 preamp power audio tube w/ original box, heavy tube, legendary tone

vintage production w/ the most precious tube-era metallurgy and warm sound reproduction

carefully curated screened and twice tested for conductance, plus free postage!

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full conductance test +life test pass! a key longetivity indicator

our unique gm output test applies 225 vdc simulating actual operations w/ filtered dc

ships fast well packed worldwide

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authentic vintage hifidelity audiophile / preamp / mic tube curation 

+ limited special editions + rare true-nos sealed box + pinched waist +high-resolution headphones