dripping with vintage vibe, old production toshiba 5u4 provide an open yet mellow sound stage like a vinyl record

revered by guitar players for rich creamy sound reproduction, toshiba highlight the warm tube-eras precious metallurgy

involving beautiful clean tones that shine in low to mid gain apps, later breakup is harmonically rich and layered

defined lows relaxed mids and sweet highs, high musicality classic for preamps stereos tube mics and more hifi apps

whether its vocals instrumentals or percussion, the holographic sonic imaging of vintage toshiba are legendary

 take your listening experience to a higher dimension w/ engaging detail and immersive harmonic smooth imaging
beautiful live-concert style delineation between instruments vocals and percussion, also great for classical

w/ dual disc getters and black plates, legendary tonality, direct japan imports carefully curated and selected


limited run special edition star series! = highest grade ever made (the cca of japan) specially screened batch selected burn-in

this translates into a lower noise floor, longer life, and highest quality triode matching important in push-pull preamps


full conductance mutual gm test 100 % mutual gm (65 % good) + useful life test pass! a key longetivity indicator
our unique mutual gm output test applies 225 vdc simulating actual operations w/ filtered dc + leak short and gas check
give up to 100+ session hours w/ your specific amps voltage to fully cure (break-in is important)
ships well packed worldwide w/ free economy postage! several in stock

authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics, see our website
+ limited special editions + rare true-nos sealed box + pinched waist + high-resolution headphones