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)

telefunken lab screened tubes are the top sonic echelon e88cc (cca), preferred in mono blocks and low noise hifidelity setups
these sought after types by audiophiles are very hard to find and collectible for their incredible screening process in germany
these revered true audiophile crown jewels feature harmonic doubling which layers vocals chords and instrument delineation
legendary organic transparency, liquid sound reproduction and holographic 'natural' flat-mid response is revered worldwide
considered the most magical sound ever made w/ the most precious tube-era metallurgy warmth and subtle compression
the organic tonaality reminds us of siemens yet smoother clear resolve w/ a pleasant 3-dimensional ceiling and sparkley highs
authentic milky ring top w/ <> diamond base bottom and both special lab screening marks (not a relabel like some sellers)
see attached sound curves all telefunken share (whether its e88cc cca 6922)...its the key selection and batch testing burn-in

full nos conductance test pristine balance 124/125 % 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 gas short check
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 test them in a phono stage
all our tubes undergo a proprietary value-added screen and careful deox process = audio grade + plus free postage!
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/ telefunken box 

~ authentic vintage hifidelity audio curation by caliacoustics~