the legendary 5751 gold pin sylvania triple mica is an audiophile crown jewel! premium 12ax7 ecc83 w/ slightly less gain
revered by audiophiles, and considered the holy grail top sonic echelon for its low noise and holographic sound reproduction
these rare collectibles are the gb 'gold brand' which so many listeners seek out, reviews outranking mullard and even rca
often regarded as a 3-dimensional immersive sound stage, highly musical, subtle warmth, lush transparent clarity and realism
known for articulation and complex tonalities, sylvania was one of the first companies to ever make 12ax7 (well before ecc83)
this unique classic was originally branded for burroughs usa (famous for their nixie tubes! and 1950s precision components)

introduced back in 1949, 5751 are a military spec rugged industrial grade high performance 12ax7 ecc83 plugin sub
originally designed for aviation, triple-mica 5751 were costly, and feature a slightly higher current of 175ma (vs. 150ma 12ax7)
w/ 30% less gain, they are a great way to tone shape your amps harmonics and tame your distortion stage w/ less microphonics
this reduced compression affects your overdrive, great for higher volume, and adding spank and sparkle brightness
twice tested for unparalleled accuracy (tv7) gold pin gold brand single w/ sylvania box included

full mutual gm conductance test 85/83 % gm (65% good) + important life test pass (a key longetivity indicator)
our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test / leak / short check
we also pride ourselves on a proprietary complimentary value-added refurb screening deox process, one of a kind qc
give several sessions or up to 100+ hours w/ your specific amps voltage to settle in (break-in is important)
ships well packed worldwide w/ free economy postage, singles pairs or quads available

~ authentic vintage hifidelity audio curation by caliacoustics ~
see our official site for reserve/request options, new arrivals, true-nos sealed box rarities, and limited run special editions