elevate and illuminate sound with siemens holographic depth, natural effortless pickup response, and reference grade tonality
the crown jewel of any collection, siemens germany are an audiophile classic for stereo preamp listening and playback
the top sonic echelon, professionally graded as one of the lowest distortion tube brands ever made, pure clarity kings
transparent musicality and phenomenal detail, known for incredible bass kick and clear highs, pleasant and euphoric
like a live concert in your living room, these vintage types capture the most intimate and realistic vocals, grail regard
legendary 1966 production has a deep extension and subtle warmth, pure organic imaging revered by audiophiles
fair silkscreen w/ 1966 etch code visible rx4 #6d authentic munich germany production
siemens box included, and all tubes are twice tested for mutual gm and carefully curated
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full amplification test pristine 105 % mutual gm (65 % good) + important life test pass
our life test is a key longetivity indicator, and our unique gm output test applies 225 vdc simulating actual circuit load
all tubes are also checked w/ an impeccable gas + leak/short check, and a proprietary complimentary refurb deox process
give 100+ session hours w/ your amps voltage to fully cure (breakin is important)
ships well packed worldwide, and free economy postage!
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~ authentic vintage hifidelity audio curation by caliacoustics ~
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