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)
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the top sonic echelon! elevate your sound w/ holographic imaging and neutral sound reproduction, 3 telefunken germany e88cc
audiophile crown jewels! the ribbed versions are popular and sought after for vocal fidelity and hifi stereo preamp playback
the lush smooth transitions are subtley compressed to double-up chords and instruments w/ a flat natural organic response
often compared to siemens, telefunken are transparent, liquid euphoric, and revered worldwide for a variety of genres
the sound stage is expansive and immersive, as the attached data sheets convey, w/ 3-dimensional presence
authentic ulm germany u6208403m / u4106504m / faded, milky ring tops w/ <> diamond base bottoms
twice tested + audio auditioned + includes telefunken boxes, set of 3 ships w/ free postage (a pair and a spare!)
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full conductance test balance: 12,100/12,200~12,100/11,800~11,000/11,000 mutual gm micromhos (photos attached)
nos/nib nominal spec starts at 11,000 per the manual and good tubes start at 8,000 + gas/leak/short check pass
mutual gm conductance scores are the ability to transfer current ~ especially important for push-pull preamps
all tubes are double checked for mutual gm and undergo a very useful life test ~ a key longetivity indicator
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full sound auditioned w/ closed back ultra high res monitors + aira preamps = audio grade phono mic certified
finding an audio grade e88cc can be daunting! prone to microphonics and most sellers dont phono or mic certify them
our tubes also undergo a proprietary value-added complimentary refurb and deox screening 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 and telefunken boxes
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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
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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 (6cg7 / 6fq7 soon)