2 NOS 1959 WrinkleGlass Mullard GtBrit 7L0 R9F/L +OEBoxes HolyGrail E88CC/6922

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.

6 clarity w/ layered detail + smooth compression (leading brands: telefunken/lorenz germany + tungsram). 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 / r9l print codes 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. Full pristine conductance test balance 130/130124/122 % mutual gm (65%) + useful life test pass!

Our unique gm output test applies. 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. 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). Vintage authentic hifidelity audiophile preamp tube curation by caliacoustics. Reserve/request options and limited run rarities. + special editions + rare true-nos sealed box + pinched waist. + high-resolution headphones + premium vocal stage / studio mics. 6dj8 7dj8 6922 7308 / ecc88 pcc88 e88cc e188cc cca. 12ax7 12at7 12au7 12bh7 / ecc83 ecc82 ecc81 e82cc. 6bq5 6au6a 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).