Description

1) holographic warm sound reproduction (leading brands: mullard gt britain + telefunken/siemens germany) 2) pleasant long-listen full frequency extension (leading brands: siemens germany + mullard gt britain) 3) natural tone w/ flat response transparent mid-range (leading brands: telefunken + valvo + siemens germany) 4) precision bass w/ depth and rich resolve (leading brands: siemens/valvo germany + amperex heerlen) 5) musical linear sound reproduction (leading brands: amperex heerlen + siemens germany + mullard gt britain) 6) clarity w/ layered detail + smooth compression (leading brands: telefunken/lorenz germany + tungsram) ~ elevate your sound with siemens holographic depth and natural effortless pickup response the reference grade tonality of siemens is quite transparent, musical and highly detailed known for incredible bass and clear highs, siemens are pleasant and euphoric one of the last great years! legendary 1968 production has a deep dazzling extension the rich warmth down low is combined w/ sparkley brighter resolve up top organic imaging and vocals revered by audiophiles, neutral sound reproduction less colored than heerlen and more bite and traction to your tone! ~ siemens germany are the crown jewel of any collection, pure clarity kings the top sonic echelon, professionally graded as one of the lowest distortion brands ever made add fidelity to your preamp today, try them in the position / application that sounds best to you illuminate your stereo listening or mic pre w/ an audiophile classic! authentic 1968 production code: a48k munich germany w/ authentic siemens box carefully curated selected and screened authentic collectible, twice tested for accuracy! + phono audio grade ~ full conductance test 96/94% mutual gm (65%)+ life test pass! (life check = key longetivity indicator) our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test and leak/short check mutual gm scores = current transfer ability, especially important for push pull amps all tubes are twice tested for unparalleled accuracy, via supplier tv7/ or hickok 539 ~ finding an audio grade e88cc/6922/cca can be daunting! most sellers dont check them for noise or phono grade / mic certified e88cc are prone to microphonics if mishandled due to their fragile frame-grids which provide their incredible resolution plus full sound auditioned w/ closed back ultra high resmonitors and aira preamps = noise free + no microphonics we pride ourselves on a proprietary complimentary value-added complete refurb screen and deox process give several sessions or up to 100+ hours w/ your specific amps voltage to settle in (break-in is important) ships fast well packed worldwide + free postage! ~ authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics see our official site! reserve/request options and part number list below including limited special editions + rare true-nos sealed box + pinched waist also high-resolution headphones + premium vocal stage and studio mics ~ 6dj8 7dj8 6922 7308 / ecc88 pcc88 e88cc e188cc cca 12ax7 12at7 12au7 12bh7 / ecc83 ecc82 ecc81 e82cc 6bq5 6au6 6267 6ca7 6ca4 6aq5 / 6v6 6l6 6sl7 6sn7 5y3 5u4 5ar4 5814 5751 5965 6189 6201 7062 7189 / cv2492 cv4004 cv455 cv4085 el34 el84 ef86 ef94 ez81 ecc85 e180cc e80cf gz34 (ef804 soon)