1) holographic sound reproduction (amperex usa + telefunken / siemens germany + mullard gt britain + heerlen holland) 
2) long-listen full frequency w/ pleasant extension (heerlen holland + siemens germany + mullard gt britain + tesla czech) 
3) natural organic tone w/ flat mid band response (amperex usa + telefunken / siemens / valvo germany + mullard mitcham)
4) precision bass w/ depth and lush sonic resolve (heerlen holland + siemens / valvo germany + ei yugo + tungsram hungary)
5) warm musical dynamic sound stage (amperex usa / heerlen + siemens / valvo germany + mullard blackburn + bugleboy)
6) clarity w/ layered detail and subtle tone compression (telefunken / lorenz germany + tungsram hungary + tesla czech)
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mullard wrinkle glass are the top sonic echelon for linear holographic sound reproduction w/ a sparkley luminous resolve
the rarest limited-run 1959 production feature a unique wavy mottled glass which captures more 3-dimensional warmth
the breath of life, earliest most precious metallurgy is highly sought after by audiophiles w/ 7l0 r9f print code still visible
the high resolution presentation is pleasant yet rich in harmonic imaging, especially important for vocals and instruments
the expansive euphoric transparent sound stage is the crown jewel of any collection, ruler-flat mids capture intimate fidelity
authentic candle tip w/ original boxes, twice tested and sound circuit studio auditioned, and includes free postage!
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full pristine conductance test balance 130/128~130/130 % mutual gm (65%) + useful life test pass! (key longetivity indicator)
our unique gm output test applies real world circuit voltages and has an impeccable gas short and leakage test
mutual gm conductance is the ability to transmit current, especially important for push-pull and high end preamps
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finding an audiophile grade 6922/e88cc can be daunting! most don't check for phono-level noise or mic certify them
we pride ourselves on a proprietary value-added complimentary refurb screening and deox process
full studio sound auditioned w/ ultra high-res closed-back monitors and premium aira preamps
give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important)
ships well packed worldwide
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vintage authentic hifidelity audiophile preamp tube curation by caliacoustics
see our official site! reserve/request options and limited run rarities
+ special editions + rare true-nos sealed box + pinched waist + high-resolution headphones